Follow-up tasks for CR bump to v0.14.0

[sbueringer]

This issue contains some follow-up tasks which should be done after we bumped to the CR v0.14.0 release

Prereqs:

• ⚠️ Bump controller-runtime 0.13.1=>0.14.1 #7906 must be merged first

Tasks:

• Check if we can simplify unit tests now that the fake client supports indexes: ✨ Add indexes to fake client to mimic field selectors controller-runtime#2025
• Verify the kubeconfig change works as expected (🌱 Register kubeconfig flag variable via RegisterFlags func controller-runtime#1999)
• replace sets.String
  • PR: 🌱 Replace deprecated string set through generic set #8004

/kind cleanup

[sbueringer]

/assign
/triage accepted

[sbueringer]

Moved v0.15 stuff to #8093

[sbueringer]

Regarding: Check if we can simplify unit tests now that the fake client supports indexes

Technically we could refactor some tests to use fake client instead of test env. Mainly the ClusterClass webhook unit tests that we had to implement with envtest. But to be honest I don't see enough upside to invest the effort in migrating those tests to fakeclient.

(cc @killianmuldoon)

[sbueringer]

Regarding: Verify the kubeconfig change works as expected

Verified the behavior and --kubeconfig works as expected for us

[sbueringer]

/close

given comments above

[k8s-ci-robot]

@sbueringer: Closing this issue.

In response to this:

/close

given comments above

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