Automatic merge from submit-queue (batch tested with PRs 61962, 58972, 62509, 62606). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Allow a test suite reusing framework to register namespaces to delete

If the suite bypasses CreateNamespace (because it wants to create more
specialized namespaces) it has no way to register deletes.

@liggitt this was something that came up in an older rebase and was missed (for things creating projects)