Issue: [BUG] payout routing for Sepa transactions result in a 4xx error

### Bug Description

Creating payout transactions for SEPA are resulting in a 4xx error with below message.

```
{
    "error": {
        "type": "invalid_request",
        "message": "No eligible connector was found for the current payment method configuration",
        "code": "IR_39"
    }
}
```

### Expected Behavior

Payout transactions for SEPA should be routed through eligible connectors.

### Actual Behavior

Payout routing fails to get an eligible connector for SEPA bank transfers.

### Steps To Reproduce

1. Create Wise connector
2. Try creating a SEPA payout
3. It should throw below error response

```
{
    "error": {
        "type": "invalid_request",
        "message": "No eligible connector was found for the current payment method configuration",
        "code": "IR_39"
    }
}
```


### Context For The Bug

This is happening due to a mismatch in what is configured for available payment methods during MCA creation - which stores `sepa` as payment method type in DB - vs what is used during payout routing - which uses `sepa_bank_transfer` for SEPA transactions.

MCA creation on dashboard uses a wasm build which contains the info for enabling the right payment method types for payouts. It is configured to use `sepa` instead of `sepa_bank_transfer` (which is being used in the payout flow).

There was an activity to rename `Sepa` to `SepaBankTransfer` recently. More details [here](https://github.com/juspay/hyperswitch/pull/7575).


### 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!

Resolution: <think>
PR Context:
- Title: chore(wasm): update sepa to sepa_bank_transfer for payout MCAs
- Merged: 2025-09-25T07:49:03Z
- Files changed: 3 files
- Commits: 1 commits

Implementation approach:
## 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 updates the payout MCA creation to use `sepa_bank_transfer` instead of `sepa`.

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!--
Prov
</think>

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