fix: Remove FieldSelector from non-namespaced resources

[mrueg]

What this PR does / why we need it:
This should resolve the issue with namespace-denylist as discovered in #2187

Regression introduced in c3c5528

I'm not sure if the fix is complete or other resources are affected. I'm also not sure if this is the right fix or we should simply keep the field selector but fail if the field doesn't exist.

@dgrisonnet @rexagod

How does this change affect the cardinality of KSM: (increases, decreases or does not change cardinality)
None
Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #2187

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[mrueg]

Replaced by #2190