CP/DP Split: Remove prometheus logger

[sjberman]

The prometheus logger is no longer needed since we don't collect nginx metrics in the control plane anymore.

Also updated agent dependencies to fix the broken build.

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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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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.70%. Comparing base (6337c97) to head (8840c13).
Report is 265 commits behind head on change/control-data-plane-split.

Files with missing lines	Patch %	Lines
internal/mode/static/manager.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                         Coverage Diff                         @@
##           change/control-data-plane-split    #3349      +/-   ##
===================================================================
- Coverage                            89.74%   86.70%   -3.05%     
===================================================================
  Files                                  109      129      +20     
  Lines                                11150    14728    +3578     
  Branches                                50       62      +12     
===================================================================
+ Hits                                 10007    12770    +2763     
- Misses                                1083     1814     +731     
- Partials                                60      144      +84     

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[salonichf5]

lgtm