feat: implement conditional secret management

[fykaa]

Fixes: https://github.com/akuity/kargo/issues/2214

Key changes include:

1. Configuration updates:

   • EnableSecretManagement flag
   • modified ClusterRole and ConfigMap to manage secrets based on this flag
   • updated values.yaml and config.go to incorporate the new setting

2. API enhancements:

   • updated GetConfig endpoint to include SecretManagementEnabled status

3. Endpoint adjustments:

   • ensure endpoints for managing secrets return connect.CodeUnimplemented when secret management is disabled

cc: @krancour @rbreeze

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[krancour]

It looks like a few unit tests that use the credential management endpoints may need an update. Their config needs secret management enabled.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 8.69565% with 21 lines in your changes missing coverage. Please review.

Project coverage is 48.26%. Comparing base (a64eb0e) to head (4225454). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/api/delete_credentials_v1alpha1.go	0.00%	5 Missing :warning:
internal/api/get_credentials_v1alpha1.go	0.00%	4 Missing and 1 partial :warning:
internal/api/list_credentials_v1alpha1.go	0.00%	5 Missing :warning:
internal/api/update_credentials_v1alpha1.go	0.00%	5 Missing :warning:
internal/api/config/config.go	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2517 +/- ## ========================================== - Coverage 48.32% 48.26% -0.06% ========================================== Files 254 254 Lines 18133 18155 +22 ========================================== + Hits 8762 8763 +1 - Misses 8889 8909 +20 - Partials 482 483 +1 ```

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[krancour]

@rbreeze any chance we can get you to amend this PR with the bits to hide credential-management functionality when the config endpoint says its not enabled?

[rbreeze]

@fykaa @krancour Sure thing, just pushed the update 👍🏻

[krancour]

Added a tiny fix in 92f07be85881f3e7df6d34837893bf809536750a

[krancour]

Thank you @fykaa! This is great!

[krancour]

And @rbreeze, thanks to you as well!