fix: remove patch label/ annotation cross contamination (#3754)

[sjberman]

Cherrypick of #3754

Problem: Patching the Service object labels and annotations results in the Deployment also getting these labels and annotations, and vice versa, which is unexpected behavior.

Solution: Create separate copies of the base label and annotation maps for each object. Since maps are passed by reference in Go, modifying the labels for one object was affecting the other by updating the shared reference.

Checklist

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• 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

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

Fixed an issue where NginxProxy patches applied to one resource type (Service/Deployment/DaemonSet) would unintentionally modify other resource types.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.93%. Comparing base (9b7c9a8) to head (ce25d13).
⚠️ Report is 1 commits behind head on release-2.1.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-2.1    #3766      +/-   ##
===============================================
- Coverage        86.93%   86.93%   -0.01%     
===============================================
  Files              128      128              
  Lines            15986    16000      +14     
  Branches            62       62              
===============================================
+ Hits             13898    13909      +11     
- Misses            1921     1923       +2     
- Partials           167      168       +1     

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