K8SPG-637: add `internal.` prefix to operator finalizers #3700

Job	Run time
runner / manifests	1m 31s
runner / suggester / gofmt	5s
runner / suggester / golangci-lint	2m 50s
runner / alex	36s
runner / misspell	15s
runner / shellcheck	6s
runner / suggester / shfmt	18s
	5m 41s

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