refactor: [Mollie] Remove Default Case Handling

[davidkurilla]

Type of Change

• [ ] Bugfix
• [ ] New feature
• [ ] Enhancement
• [x] Refactoring
• [ ] Dependency updates
• [ ] Documentation
• [ ] CI/CD

Description

Refactor mollie connector default match cases. Default match arm now accounts for all enum variants in its case rather than default _ case. This PR closes Issue #4055

Additional Changes

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

Motivation and Context

This change refactors the default case handling in the mollie connector of the router crate. This change encourages developers to cover all enum variants rather than rely on default _ case.

How did you test it?

Checklist

• [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

[SanchithHegde]

@davidkurilla Could you please address the merge conflicts?