Issue:
Bug: [REFACTOR] : [Multisafepay] Error Message For Connector Implementation



### :memo: Feature Description

- In terms of errors, we are currently throwing a 'not supported' message, which shouldn't be the case as we are yet to decide on the implementation.


### :hammer: Possible Implementation

- In order to manage payment methods that are not implemented by Hyperswitch or yet to be implemented, the connector transformers file should make use of the NotImplemented ConnectorError enum variant.
- By doing so, we will throw same error message for all the Connector Implementation 
- You can check this PR for further reference https://github.com/juspay/hyperswitch/pull/2831


:bookmark: Note: All the changes needed should be contained within `hyperswitch/crates/router/src/connector/`


### :package: Have you spent some time checking if this feature request has been raised before?

- [X] I checked and didn't find a similar issue

### :package: Have you read the Contributing Guidelines?

- [X] I have read the [Contributing Guidelines](https://github.com/juspay/hyperswitch/blob/main/docs/CONTRIBUTING.md)

### :sparkles: Are you willing to submit a PR?


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
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### 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`
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## Motivation and Context
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## How did you test it?
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## Checklist
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- [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

resolve #2842 

Testing:

Patch:
diff --git a/crates/router/src/connector/multisafepay/transformers.rs b/crates/router/src/connector/multisafepay/transformers.rs
index 1780b77379c..fb62643d667 100644
--- a/crates/router/src/connector/multisafepay/transformers.rs
+++ b/crates/router/src/connector/multisafepay/transformers.rs
@@ -262,10 +262,9 @@ impl TryFrom<utils::CardIssuer> for Gateway {
             utils::CardIssuer::Visa => Ok(Self::Visa),
             utils::CardIssuer::DinersClub
             | utils::CardIssuer::JCB
-            | utils::CardIssuer::CarteBlanche => Err(errors::ConnectorError::NotSupported {
-                message: issuer.to_string(),
-                connector: "Multisafe pay",
-            }
+            | utils::CardIssuer::CarteBlanche => Err(errors::ConnectorError::NotImplemented(
+                utils::get_unimplemented_payment_method_error_message("Multisafe pay"),
+            )
             .into()),
         }
     }