fix casting of slices of services

[rtay1188]

Checklist

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Description

Previously, we were attempting to cast []*v1.Service to metav1.Object. This is because the cached services are stored as slices, as each identity could have more than one service. Instead, we check the service that we got the event for against each of the services in the slice to pick the right one in the cache to cast to metav1.Object.

Thank you!

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Codecov Report

Attention: Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 71.71%. Comparing base (14b4735) to head (afbe175).

Files with missing lines	Patch %	Lines
admiral/pkg/controller/admiral/controller.go	87.50%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #340      +/-   ##
==========================================
+ Coverage   71.65%   71.71%   +0.05%     
==========================================
  Files          66       66              
  Lines        9212     9226      +14     
==========================================
+ Hits         6601     6616      +15     
+ Misses       2253     2252       -1     
  Partials      358      358              

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