Test for finalizers

[nolar]

Issue : #13

Add tests for the finalizers: appending, removing, checking.

Also change the finalizer to a FQDN string — as once I hit the issue that the finalizer cannot be an arbitrary string (e.g. when assigning it to a pod in Minikube; but it works with custom resources though).

But keep the legacy finalizer (just a string, not FQDN) if it is assigned to the existing resource — for checking and for removing.

[zincr]

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[zincr]

🤖 zincr found 1 problem , 0 warnings

❌ Approvals
✅ Large Commits
✅ Specification
✅ Dependency Licensing

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• ✅ Approved by PR author @nolar
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