Fix Service reconciliation error loop

[enrichman]

Fix #496 by checking that the Services owned by the Cluster are resources within the virtual cluster.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.07%. Comparing base (9f265c7) to head (a0170c0).

Files with missing lines	Patch %	Lines
pkg/controller/cluster/service.go	50.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #497      +/-   ##
==========================================
- Coverage   54.15%   54.07%   -0.08%     
==========================================
  Files          56       56              
  Lines        6552     6559       +7     
==========================================
- Hits         3548     3547       -1     
- Misses       2736     2747      +11     
+ Partials      268      265       -3     

Flag	Coverage Δ
cli	51.95% <50.00%> (+0.25%)	⬆️
controller	53.66% <50.00%> (-0.25%)	⬇️
e2e	53.66% <50.00%> (-0.25%)	⬇️
unit	40.79% <0.00%> (-0.11%)	⬇️

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