E2E tests for different feature gate states

[m1kola]

Now that we have this feature gate:

https://github.com/operator-framework/operator-controller/blob/b8f36268517dc39280fe964d131a6e3ff7ac9335/pkg/features/features.go#L19

We should find a way to run E2E in CI with different states of feature gates.

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One option is to use kustomze overlays for different configurations (potentially using components). However this means that we need one overlay for every permutation which might become a bit messy.

We can also look into Kubernetes tests and see what is done there and whether we can re-use any tools/code (we use k8s.io/component-base/featuregate package for feature gates, same as Kubernetes).