Add mgmt configmap tests

[nginx-bot]

Proposed changes

• Adding mgmt configmap tests
• Fix bug: at runtime a mgmt ClientAuth cert was in the wrong directory.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 25 lines in your changes missing coverage. Please review.

Project coverage is 52.54%. Comparing base (025ddd7) to head (60d540b).

Files with missing lines	Patch %	Lines
internal/k8s/controller.go	0.00%	21 Missing ⚠️
internal/configs/configurator.go	71.42%	4 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## release-4.0 #6965 +/- ## =============================================== - Coverage 52.59% 52.54% -0.05%  =============================================== Files 88 88 Lines 20789 20803 +14 =============================================== - Hits 10933 10931 -2  - Misses 9401 9417 +16  Partials 455 455 

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