Add tests for jwt jwksuri

[vepatel]

Proposed changes

• Add test for jwt jwksuri feature
• CI changes to fetch Azure AD secret from github
• minor change in jwks docs

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-commenter]

Codecov Report

Merging #3511 (6da2077) into main (9198212) will decrease coverage by 0.03%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main    #3511      +/-   ##
==========================================
- Coverage   52.00%   51.98%   -0.03%     
==========================================
  Files          60       60              
  Lines       16816    16816              
==========================================
- Hits         8746     8742       -4     
- Misses       7775     7777       +2     
- Partials      295      297       +2     

Impacted Files	Coverage Δ
internal/k8s/configuration.go	95.43% <0.00%> (-0.37%)	⬇️

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