feat: allow project scoped generic kubernetes secrets

[Marvin9]

This PR now allows create generic k8s secrets

TODO:

• [x] API - Update secret
• [x] Tests

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 38.88889% with 99 lines in your changes missing coverage. Please review.

Project coverage is 51.27%. Comparing base (27f501c) to head (cad6f83). Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/api/create_credentials_v1alpha1.go	47.00%	46 Missing and 7 partials :warning:
internal/api/update_credentials_v1alpha1.go	25.80%	45 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2975 +/- ## ========================================== + Coverage 50.90% 51.27% +0.36% ========================================== Files 279 282 +3 Lines 25178 25594 +416 ========================================== + Hits 12818 13124 +306 - Misses 11669 11760 +91 - Partials 691 710 +19 ```

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[Marvin9]

@krancour generic secret creation and listing those is ready. Till I figure out what to do for updates could you start looking at the backend code?

Also do you think its better to re-use the create resource API instead of modifying the create credentials?