Issue:
Bug: [CYPRESS] Fiuu Connector Configuration and Payment Processing Issues



The FIUU Connector is not functioning as expected.

### Expected Behavior:  
- The Fiuu Connector should be configurable without errors.  
- Test Cases should pass successfully through the Fiuu Payment Connector.  

### Actual Behavior:  
- Errors occur during the configuration process.  
- Test Cases do not go through as expected.  

Pull request description:
## Type of Change

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [x] CI/CD

## Description
<!-- Describe your changes in detail -->
The FIUU Connector was not functioning as expected.

## Key Changes

- Added fiuu connector configs for `PaymentConfirmWithShippingCost`, `ZeroAuthMandate`, and `SaveCardConfirmAutoCaptureOffSessionWithoutBilling`.
- Added `billing.email` in some places in the configs where it was a required parameter.
- Mapped `error_message: "The currency not allow for the RecordType"` wherever necessary.
- Mandate Payments using PMID responds with the `connector_transaction_id: null` if the payment fails. So, changed the command accordingly.
- Fiuu does not support Connector Diagnostic, so updated the exclusion list to include Fiuu connector.


### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables


## Motivation and Context
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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
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## How did you test it?
Initial Condition
<img width="710" alt="image" src="https://github.com/user-attachments/assets/976bb14e-c200-4d34-a61d-a8ab46115824" />

Current Condition
<img width="710" alt="image" src="https://github.com/user-attachments/assets/3f01b9c3-3de1-468a-b022-2733d1c03c0b" />



## Checklist
<!-- Put an `x` in the boxes that apply -->

- [ ] I formatted the code `cargo +nightly fmt --all`
- [ ] I addressed lints thrown by `cargo clippy`
- [ ] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible


Testing:
Initial Condition
<img width="710" alt="image" src="https://github.com/user-attachments/assets/976bb14e-c200-4d34-a61d-a8ab46115824" />

Current Condition
<img width="710" alt="image" src="https://github.com/user-attachments/assets/3f01b9c3-3de1-468a-b022-2733d1c03c0b" />

Patch: