Issue:
Bug: [BUG] 5xx during External Authentication through Netcetera Fails



### Bug Description

In some very rare scenarios, when external authentication fails from netcetera, hyperswitch throws 5xx because of error message deserialization error. 

The error object returned by netcetera is inconsistent with their official documentation. Few fields that were marked as required were missing in the actual response. This caused deserialization failure.

### Expected Behavior

Hyperswitch should be retuning appropriate error message instead of throwing 5xx.

### Actual Behavior

Hyperswitch throws 5xx.

### Steps To Reproduce

Provide an unambiguous set of steps to reproduce this bug. Include code or configuration to reproduce, if relevant.
1. Create a payment by enabling external authentication.
2. Confirm the payment
3. Do auth call. 
4. Check if 5xx is thrown.

### Context For The Bug

_No response_

### Environment

Are you using hyperswitch hosted version? Yes/No
If yes, please provide the value of the `x-request-id` response header to help us debug your issue.

If not (or if building/running locally), please provide the following details:
1. Operating System or Linux distribution:
2. Rust version (output of `rustc --version`): ``
3. App version (output of `cargo r --features vergen -- --version`): ``


### Have you spent some time checking if this bug has been raised before?

- [X] I checked and didn't find a similar issue

### Have you read the Contributing Guidelines?

- [X] I have read the [Contributing Guidelines](https://github.com/juspay/hyperswitch/blob/main/docs/CONTRIBUTING.md)

### Are you willing to submit a PR?

Yes, I am willing to submit a PR!

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 -->
Few fields in netcetera error object that were marked required in the official api documentation were missing in api response body. This caused deserialization failure at hyperswitch. 

So made those fields optional.


### 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).
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## 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)?
-->
Manual.
Tested sanity of Netcetera Authentication Connector.

## 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


Testing:

Manual.
Tested sanity of Netcetera Authentication Connector.

Patch:
diff --git a/crates/router/src/connector/netcetera.rs b/crates/router/src/connector/netcetera.rs
index 43df87db40f..714873cfb53 100644
--- a/crates/router/src/connector/netcetera.rs
+++ b/crates/router/src/connector/netcetera.rs
@@ -107,7 +107,7 @@ impl ConnectorCommon for Netcetera {
             status_code: res.status_code,
             code: response.error_details.error_code,
             message: response.error_details.error_description,
-            reason: Some(response.error_details.error_detail),
+            reason: response.error_details.error_detail,
             attempt_status: None,
             connector_transaction_id: None,
         })
diff --git a/crates/router/src/connector/netcetera/transformers.rs b/crates/router/src/connector/netcetera/transformers.rs
index 25ed7c5271e..9218c2eaf1e 100644
--- a/crates/router/src/connector/netcetera/transformers.rs
+++ b/crates/router/src/connector/netcetera/transformers.rs
@@ -105,8 +105,8 @@ impl
             NetceteraPreAuthenticationResponse::Failure(error_response) => {
                 Err(types::ErrorResponse {
                     code: error_response.error_details.error_code,
-                    message: error_response.error_details.error_detail,
-                    reason: Some(error_response.error_details.error_description),
+                    message: error_response.error_details.error_description,
+                    reason: error_response.error_details.error_detail,
                     status_code: item.http_code,
                     attempt_status: None,
                     connector_transaction_id: None,
@@ -173,8 +173,8 @@ impl
             }
             NetceteraAuthenticationResponse::Error(error_response) => Err(types::ErrorResponse {
                 code: error_response.error_details.error_code,
-                message: error_response.error_details.error_detail,
-                reason: Some(error_response.error_details.error_description),
+                message: error_response.error_details.error_description,
+                reason: error_response.error_details.error_detail,
                 status_code: item.http_code,
                 attempt_status: None,
                 connector_transaction_id: None,
@@ -234,20 +234,20 @@ pub struct NetceteraErrorDetails {
     pub error_code: String,
 
     /// Code indicating the 3-D Secure component that identified the error.
-    pub error_component: String,
+    pub error_component: Option<String>,
 
     /// Text describing the problem identified.
     pub error_description: String,
 
     /// Additional detail regarding the problem identified.
-    pub error_detail: String,
+    pub error_detail: Option<String>,
 
     /// Universally unique identifier for the transaction assigned by the 3DS SDK.
     #[serde(rename = "sdkTransID")]
     pub sdk_trans_id: Option<String>,
 
     /// The Message Type that was identified as erroneous.
-    pub error_message_type: String,
+    pub error_message_type: Option<String>,
 }
 
 #[derive(Debug, Serialize, Deserialize)]