Ensure noop delete due to terminating namespaces takes into account that a namespace might have been terminated already

[100mik]

What steps did you take:
Delete a namespace with an App scoped to a few namespaces, all of whom are terminating.

What happened:
App did not fallback to noop delete

What did you expect:
App should have ignored finalisers and unblocked ns deletion

Anything else you would like to add:
We need to account for the case where a namespace might be deleted before we check on it's status.

---

Vote on this request

This is an invitation to the community to vote on issues, to help us prioritize our backlog. Use the "smiley face" up to the right of this comment to vote.

👍 "I would like to see this addressed as soon as possible"
👎 "There are other more important things to focus on right now"

We are also happy to receive and review Pull Requests if you want to help working on this issue.