Issue:
Bug: Remove validation for `mandate_data` object in payments create request



- Mandate data to be an optional field and not a required param for setup_future_usage:off-session payments

Pull request description:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
This PR removes the validation such that mandate data to be an optional field and not a required param for setup_future_usage: off-session payments

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!--
Provide links to the files with corresponding changes.

Following are the paths where you can find config files:
1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
-->


## Motivation and Context
<!--
Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.

If you don't have an issue, we'd recommend starting with one first so the PR
can focus on the implementation (unless it is an obvious bug or documentation fix
that will have little conversation).
-->


## How did you test it?
<!--
Did you write an integration/unit/API test to verify the code changes?
Or did you test this change manually (provide relevant screenshots)?
-->
Before removing validation - 

```
curl --location 'http://localhost:8080/payments' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: dev_nDlEYaebMeZFC4W7OzfK7g3ohwAqztjYxNVk58rg755miOXOFdmB3CBGJzRqvMEs' \
--data-raw '{
    "amount": 0,
    "currency": "USD",
    "confirm": true,
    "capture_method": "automatic",
    "capture_on": "2022-09-10T10:11:12Z",
    "customer_id": "cus_eTs98Of0QUAoWNfv7Fyt",
    "business_country": "US",
    "business_label": "default",
    "email": "guest@example.com",
    "name": "John Doe",
    "phone": "999999999",
    "phone_country_code": "+1",
    "description": "Its my first payment request",
    "authentication_type": "no_three_ds",
    "return_url": "https://google.com",
    "setup_future_usage": "off_session",
    "payment_method": "card",
    "payment_method_type": "credit",
    "payment_type": "setup_mandate",
    "payment_method_data": {
        "card": {
            "card_number": "4242424242424242",
            "card_exp_month": "10",
            "card_exp_year": "25",
            "card_cvc": "123"
        }
    },
    "shipping": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "joseph",
            "last_name": "Doe"
        },
        "phone": {
            "number": "8056594430",
            "country_code": "+91"
        }
    },
    "billing": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "joseph",
            "last_name": "Doe"
        },
        "phone": {
            "number": "8056594427",
            "country_code": "+91"
        }
    },
    "statement_descriptor_name": "joseph",
    "statement_descriptor_suffix": "JS",
    "metadata": {
        "udf1": "value1",
        "new_customer": "true",
        "login_date": "2019-09-10T10:11:12Z"
    }
}'
```

![image](https://github.com/juspay/hyperswitch/assets/70657455/4df97e1a-5174-4a2e-b842-301c6494eb9c)


After removing validation (same curl req)- 

```
curl --location 'http://localhost:8080/payments' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: dev_nDlEYaebMeZFC4W7OzfK7g3ohwAqztjYxNVk58rg755miOXOFdmB3CBGJzRqvMEs' \
--data-raw '{
    "amount": 0,
    "currency": "USD",
    "confirm": true,
    "capture_method": "automatic",
    "capture_on": "2022-09-10T10:11:12Z",
    "customer_id": "cus_eTs98Of0QUAoWNfv7Fyt",
    "business_country": "US",
    "business_label": "default",
    "email": "guest@example.com",
    "name": "John Doe",
    "phone": "999999999",
    "phone_country_code": "+1",
    "description": "Its my first payment request",
    "authentication_type": "no_three_ds",
    "return_url": "https://google.com",
    "setup_future_usage": "off_session",
    "payment_method": "card",
    "payment_method_type": "credit",
    "payment_type": "setup_mandate",
    "payment_method_data": {
        "card": {
            "card_number": "4242424242424242",
            "card_exp_month": "10",
            "card_exp_year": "25",
            "card_cvc": "123"
        }
    },
    "shipping": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "joseph",
            "last_name": "Doe"
        },
        "phone": {
            "number": "8056594430",
            "country_code": "+91"
        }
    },
    "billing": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "joseph",
            "last_name": "Doe"
        },
        "phone": {
            "number": "8056594427",
            "country_code": "+91"
        }
    },
    "statement_descriptor_name": "joseph",
    "statement_descriptor_suffix": "JS",
    "metadata": {
        "udf1": "value1",
        "new_customer": "true",
        "login_date": "2019-09-10T10:11:12Z"
    }
}'
```

Payment succeeded - 
![image](https://github.com/juspay/hyperswitch/assets/70657455/7827566e-2a15-4ded-be76-c3e8e7b34079)



## Checklist
<!-- Put an `x` in the boxes that apply -->

- [x] I formatted the code `cargo +nightly fmt --all`
- [x] I addressed lints thrown by `cargo clippy`
- [x] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible
- [ ] I added a [CHANGELOG](/CHANGELOG.md) entry if applicable


Testing:

Before removing validation - 

```
curl --location 'http://localhost:8080/payments' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: dev_nDlEYaebMeZFC4W7OzfK7g3ohwAqztjYxNVk58rg755miOXOFdmB3CBGJzRqvMEs' \
--data-raw '{
    "amount": 0,
    "currency": "USD",
    "confirm": true,
    "capture_method": "automatic",
    "capture_on": "2022-09-10T10:11:12Z",
    "customer_id": "cus_eTs98Of0QUAoWNfv7Fyt",
    "business_country": "US",
    "business_label": "default",
    "email": "guest@example.com",
    "name": "John Doe",
    "phone": "999999999",
    "phone_country_code": "+1",
    "description": "Its my first payment request",
    "authentication_type": "no_three_ds",
    "return_url": "https://google.com",
    "setup_future_usage": "off_session",
    "payment_method": "card",
    "payment_method_type": "credit",
    "payment_type": "setup_mandate",
    "payment_method_data": {
        "card": {
            "card_number": "4242424242424242",
            "card_exp_month": "10",
            "card_exp_year": "25",
            "card_cvc": "123"
        }
    },
    "shipping": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "joseph",
            "last_name": "Doe"
        },
        "phone": {
            "number": "8056594430",
            "country_code": "+91"
        }
    },
    "billing": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "joseph",
            "last_name": "Doe"
        },
        "phone": {
            "number": "8056594427",
            "country_code": "+91"
        }
    },
    "statement_descriptor_name": "joseph",
    "statement_descriptor_suffix": "JS",
    "metadata": {
        "udf1": "value1",
        "new_customer": "true",
        "login_date": "2019-09-10T10:11:12Z"
    }
}'
```

![image](https://github.com/juspay/hyperswitch/assets/70657455/4df97e1a-5174-4a2e-b842-301c6494eb9c)


After removing validation (same curl req)- 

```
curl --location 'http://localhost:8080/payments' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: dev_nDlEYaebMeZFC4W7OzfK7g3ohwAqztjYxNVk58rg755miOXOFdmB3CBGJzRqvMEs' \
--data-raw '{
    "amount": 0,
    "currency": "USD",
    "confirm": true,
    "capture_method": "automatic",
    "capture_on": "2022-09-10T10:11:12Z",
    "customer_id": "cus_eTs98Of0QUAoWNfv7Fyt",
    "business_country": "US",
    "business_label": "default",
    "email": "guest@example.com",
    "name": "John Doe",
    "phone": "999999999",
    "phone_country_code": "+1",
    "description": "Its my first payment request",
    "authentication_type": "no_three_ds",
    "return_url": "https://google.com",
    "setup_future_usage": "off_session",
    "payment_method": "card",
    "payment_method_type": "credit",
    "payment_type": "setup_mandate",
    "payment_method_data": {
        "card": {
            "card_number": "4242424242424242",
            "card_exp_month": "10",
            "card_exp_year": "25",
            "card_cvc": "123"
        }
    },
    "shipping": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "joseph",
            "last_name": "Doe"
        },
        "phone": {
            "number": "8056594430",
            "country_code": "+91"
        }
    },
    "billing": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "joseph",
            "last_name": "Doe"
        },
        "phone": {
            "number": "8056594427",
            "country_code": "+91"
        }
    },
    "statement_descriptor_name": "joseph",
    "statement_descriptor_suffix": "JS",
    "metadata": {
        "udf1": "value1",
        "new_customer": "true",
        "login_date": "2019-09-10T10:11:12Z"
    }
}'
```

Payment succeeded - 
![image](https://github.com/juspay/hyperswitch/assets/70657455/7827566e-2a15-4ded-be76-c3e8e7b34079)

Patch:
diff --git a/crates/router/src/core/payments/operations/payment_create.rs b/crates/router/src/core/payments/operations/payment_create.rs
index 2eaa11f44ee..f4db64dcfb5 100644
--- a/crates/router/src/core/payments/operations/payment_create.rs
+++ b/crates/router/src/core/payments/operations/payment_create.rs
@@ -8,7 +8,7 @@ use data_models::{
     payments::payment_attempt::PaymentAttempt,
 };
 use diesel_models::ephemeral_key;
-use error_stack::{self, report, ResultExt};
+use error_stack::{self, ResultExt};
 use masking::PeekInterface;
 use router_derive::PaymentOperation;
 use router_env::{instrument, tracing};
@@ -628,17 +628,6 @@ impl<F: Send + Clone, Ctx: PaymentMethodRetrieve> ValidateRequest<F, api::Paymen
 
         helpers::validate_payment_method_fields_present(request)?;
 
-        if request.mandate_data.is_none()
-            && request
-                .setup_future_usage
-                .map(|fut_usage| fut_usage == enums::FutureUsage::OffSession)
-                .unwrap_or(false)
-        {
-            Err(report!(errors::ApiErrorResponse::PreconditionFailed {
-                message: "`setup_future_usage` cannot be `off_session` for normal payments".into()
-            }))?
-        }
-
         let mandate_type =
             helpers::validate_mandate(request, payments::is_operation_confirm(self))?;
 
diff --git a/crates/router/src/core/payments/operations/payment_update.rs b/crates/router/src/core/payments/operations/payment_update.rs
index 071d919eb19..494db2b8529 100644
--- a/crates/router/src/core/payments/operations/payment_update.rs
+++ b/crates/router/src/core/payments/operations/payment_update.rs
@@ -683,17 +683,6 @@ impl<F: Send + Clone, Ctx: PaymentMethodRetrieve> ValidateRequest<F, api::Paymen
 
         helpers::validate_payment_method_fields_present(request)?;
 
-        if request.mandate_data.is_none()
-            && request
-                .setup_future_usage
-                .map(|fut_usage| fut_usage == storage_enums::FutureUsage::OffSession)
-                .unwrap_or(false)
-        {
-            Err(report!(errors::ApiErrorResponse::PreconditionFailed {
-                message: "`setup_future_usage` cannot be `off_session` for normal payments".into()
-            }))?
-        }
-
         let mandate_type = helpers::validate_mandate(request, false)?;
 
         Ok((