Bug: (connector): [Netcetera] Fix message_extension field in Netcetera Response 



### Bug Description

Currently we are not recieving field **message_extension** in Netcetera's authentication response since the struct is incorrectly declared in the transformers file. 

**Current structure**
```
NetceteraAuthenticationSuccessResponse{
....
authentication_request: {
message_extension: Option<serde_json::Value>,
....
}
...
}

```

**Correct structure**
```
NetceteraAuthenticationSuccessResponse{
....
authentication_response: {
message_extension: Option<serde_json::Value>,
....
}
...
}
```

### Expected Behavior

**Correct structure**
```
NetceteraAuthenticationSuccessResponse{
....
authentication_response: {
message_extension: Option<serde_json::Value>,
....
}
...
}
```
we should be able to recieve message_extension field for CartesBacaires 3ds authentication payments via Cybersource

### Actual Behavior

**Current structure**
```
NetceteraAuthenticationSuccessResponse{
....
authentication_request: {
message_extension: Option<serde_json::Value>,
....
}
...
}

```
we are not able to currently recieve message_extension field for CartesBacaires 3ds authentication payments via Cybersource


### Steps To Reproduce

Provide an unambiguous set of steps to reproduce this bug. Include code or configuration to reproduce, if relevant.
1. Go to '...'
2. Click on '....'
3. Scroll down to '....'


### 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!
diff --git a/crates/hyperswitch_connectors/src/connectors/netcetera/transformers.rs b/crates/hyperswitch_connectors/src/connectors/netcetera/transformers.rs
index 7427cd8cd05..0c12d7415c3 100644
--- a/crates/hyperswitch_connectors/src/connectors/netcetera/transformers.rs
+++ b/crates/hyperswitch_connectors/src/connectors/netcetera/transformers.rs
@@ -170,9 +170,9 @@ impl
                     });
 
                 let message_extension = response
-                    .authentication_request
+                    .authentication_response
+                    .message_extension
                     .as_ref()
-                    .and_then(|req| req.message_extension.as_ref())
                     .and_then(|v| match serde_json::to_value(v) {
                         Ok(val) => Some(Secret::new(val)),
                         Err(e) => {
@@ -686,7 +686,6 @@ pub struct NetceteraAuthenticationFailureResponse {
 pub struct AuthenticationRequest {
     #[serde(rename = "threeDSRequestorChallengeInd")]
     pub three_ds_requestor_challenge_ind: Option<ThreedsRequestorChallengeInd>,
-    pub message_extension: Option<serde_json::Value>,
 }
 
 #[derive(Debug, Serialize, Deserialize)]
@@ -708,6 +707,7 @@ pub struct AuthenticationResponse {
     pub ds_trans_id: Option<String>,
     pub acs_signed_content: Option<String>,
     pub trans_status_reason: Option<String>,
+    pub message_extension: Option<serde_json::Value>,
 }
 
 #[derive(Debug, Deserialize, Serialize, Clone)]

## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [X] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
This PR introduces the following struct fix for netcetera authentication response since `message_extension` is recieved in Netcetera's authentication response ARes and not in AReq. 

**Current structure**
```
NetceteraAuthenticationSuccessResponse{
....
authentication_request: {
message_extension: Option<serde_json::Value>,
....
}
...
}

```

**Correct structure**
```
NetceteraAuthenticationSuccessResponse{
....
authentication_response: {
message_extension: Option<serde_json::Value>,
....
}
...
}
```

[Ref](https://docs.3dsecure.io/3dsv2/specification_231.html#attr-ARes-messageExtension) -  3dsecure.io docs highlights **message_extension**'s correct placement i.e ARes. Adding reference to 3dsecure.io docs since Netcetera documentation is not super clear.

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!--
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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)?
-->
`message_extension` field for Netcetera's authentication response is only available in prod

## 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
