Add ClusterIP service to impersonator-config-controller informer.

[mattmoyer]

Prior to this fix, this controller did not correctly react to changes to the ClusterIP service. It would still eventually react with a long delay due to our 5 minute resync interval.

Release note:

The Concierge now correctly reacts to changes in the impersonation proxy ClusterIP service immediately.

[codecov]

Codecov Report

Merging #752 (5f67905) into main (8afbb4e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #752      +/-   ##
==========================================
+ Coverage   79.87%   79.88%   +0.01%     
==========================================
  Files         124      124              
  Lines        8352     8357       +5     
==========================================
+ Hits         6671     6676       +5     
  Misses       1463     1463              
  Partials      218      218              

Impacted Files	Coverage Δ
...ntroller/impersonatorconfig/impersonator_config.go	93.15% <100.00%> (+0.05%)	⬆️

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