Remove unused service annotations

[bjee19]

Remove unused service annotations. This field on NginxProxy and set through Helm is never used, instead service annotations are set through annotations on the Gateway object.

Will update docs installation through manifests to give more information when installing with aws-nlb.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.75%. Comparing base (5abe667) to head (119197e).
Report is 1 commits behind head on change/control-data-plane-split.

Additional details and impacted files

@@                         Coverage Diff                         @@
##           change/control-data-plane-split    #3362      +/-   ##
===================================================================
+ Coverage                            86.73%   86.75%   +0.01%     
===================================================================
  Files                                  129      129              
  Lines                                14862    14862              
  Branches                                62       62              
===================================================================
+ Hits                                 12891    12893       +2     
+ Misses                                1822     1820       -2     
  Partials                               149      149              

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