Issue:
Bug: [REFACTOR] store `card_network` in locker



We have `card_brand` field in locker which is `None` currently for all cards. When a `card_network` is sent in the request, map it to `card_brand` and store it in locker.

Pull request description:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
We have `card_brand` field in locker which is `None` currently for all cards. When a `card_network` is sent in the request, we map it to `card_brand` and store it in locker.

### 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)?
-->
1. Store a payment method in locker with `card_network` field in request.

```
curl --location 'http://localhost:8080/payment_methods' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: abc' \
--data '{
    "payment_method": "card",
    "payment_method_type": "credit",
    "payment_method_issuer": "Visa",
    "card": {
        "card_number": "4111111111111111",
        "card_exp_month": "04",
        "card_exp_year": "25",
        "card_holder_name": "John",
        "card_network": "Visa"
    },
    "customer_id": "cus_spLo0JPwK16PTtBuIk1b",
    "metadata": {
        "city": "NY",
        "unit": "245"
    }
}'
```

2. Retrieve stored card with `list_customer_payment_methods` and verify whether card_network is populated.

## 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:

1. Store a payment method in locker with `card_network` field in request.

```
curl --location 'http://localhost:8080/payment_methods' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key: abc' \
--data '{
    "payment_method": "card",
    "payment_method_type": "credit",
    "payment_method_issuer": "Visa",
    "card": {
        "card_number": "4111111111111111",
        "card_exp_month": "04",
        "card_exp_year": "25",
        "card_holder_name": "John",
        "card_network": "Visa"
    },
    "customer_id": "cus_spLo0JPwK16PTtBuIk1b",
    "metadata": {
        "city": "NY",
        "unit": "245"
    }
}'
```

2. Retrieve stored card with `list_customer_payment_methods` and verify whether card_network is populated.

Patch:
diff --git a/crates/router/src/core/payment_methods/cards.rs b/crates/router/src/core/payment_methods/cards.rs
index 25bb869075c..fb8444f515b 100644
--- a/crates/router/src/core/payment_methods/cards.rs
+++ b/crates/router/src/core/payment_methods/cards.rs
@@ -1167,7 +1167,7 @@ pub async fn add_card_hs(
             name_on_card: card.card_holder_name.to_owned(),
             card_exp_month: card.card_exp_month.to_owned(),
             card_exp_year: card.card_exp_year.to_owned(),
-            card_brand: None,
+            card_brand: card.card_network.as_ref().map(ToString::to_string),
             card_isin: None,
             nick_name: card.nick_name.as_ref().map(masking::Secret::peek).cloned(),
         },
diff --git a/crates/router/src/core/payments/helpers.rs b/crates/router/src/core/payments/helpers.rs
index de2fdd99b7b..65f49237e7c 100644
--- a/crates/router/src/core/payments/helpers.rs
+++ b/crates/router/src/core/payments/helpers.rs
@@ -1,4 +1,4 @@
-use std::borrow::Cow;
+use std::{borrow::Cow, str::FromStr};
 
 use api_models::{
     mandates::RecurringDetails,
@@ -1780,9 +1780,17 @@ pub async fn retrieve_card_with_permanent_token(
             .unwrap_or_default()
             .card_cvc
             .unwrap_or_default(),
-        card_issuer: card.card_brand,
+        card_issuer: None,
         nick_name: card.nick_name.map(masking::Secret::new),
-        card_network: None,
+        card_network: card
+            .card_brand
+            .map(|card_brand| enums::CardNetwork::from_str(&card_brand))
+            .transpose()
+            .map_err(|e| {
+                logger::error!("Failed to parse card network {}", e);
+            })
+            .ok()
+            .flatten(),
         card_type: None,
         card_issuing_country: None,
         bank_code: None,