Removed old metrics server image.

[rashedkvm]

Enhanced Security: Using Controller-Runtime's built-in authentication provides better integration with Kubernetes RBAC and eliminates dependency on external kube-rbac-proxy.

Pull request

What this PR does / why we need it

Aligned with Kubebuilder's modern scaffold approach and Controller-Runtime best practices. Using Controller-Runtime's built-in authentication provides better integration with Kubernetes RBAC and eliminates dependency on external kube-rbac-proxy.

Which issue(s) this PR fixes

Fixes #384

Describe testing done for PR

Additional information or special notes for your reviewer

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.62%. Comparing base (a9a90a8) to head (f52c8d6).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
main.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #437      +/-   ##
==========================================
- Coverage   56.70%   56.62%   -0.09%     
==========================================
  Files          18       18              
  Lines        1402     1404       +2     
==========================================
  Hits          795      795              
- Misses        496      498       +2     
  Partials      111      111              

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