Add correlation_id to logs

[sjberman]

Problem: Agent logs a correlation ID when it calls the control plane. The control plane doesn't log the ID, making it hard to cross-reference and debug the connections.

Solution: For relevant logs, add the correlation ID.

Closes #4297

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

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please add a brief note that summarizes the change.

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.29%. Comparing base (eb83cdb) to head (7476793).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/controller/nginx/agent/file.go	84.21%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4506      +/-   ##
==========================================
- Coverage   86.31%   86.29%   -0.02%     
==========================================
  Files         132      132              
  Lines       14859    14874      +15     
  Branches       35       35              
==========================================
+ Hits        12825    12836      +11     
- Misses       1813     1816       +3     
- Partials      221      222       +1     

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