ROX-30138: Add tests for WithSelector

[kurlov]

Follow up for https://github.com/operator-framework/helm-operator-plugins/pull/459

Add test for WithSelector using controller manager to emulate reconcile lifecycle

[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 74.71%. Comparing base (08ab7fb) to head (0a43969). :warning: Report is 124 commits behind head on main.

:exclamation: There is a different number of reports uploaded between BASE (08ab7fb) and HEAD (0a43969). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (08ab7fb)	HEAD (0a43969)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #496       +/-   ##
===========================================
- Coverage   85.06%   74.71%   -10.35%     
===========================================
  Files          19       31       +12     
  Lines        1346     2037      +691     
===========================================
+ Hits         1145     1522      +377     
- Misses        125      433      +308     
- Partials       76       82        +6     

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