Improve nfd-gc on NodeResourceTopology objects

[marquiz]

What would you like to be added:

We could possibly improve the behavior of nfd-gc by removing stale NRT objects (whose creator pod does not exist anymore). The ownerReference field shouldn't be used as that creates warnings (see k8s garbage-collection). We could use an nfd-specific annotation (like nfd.node.kubernetes.io/owner-pod: <namespace>/<pod-uuid>). The nfd-gc would delete the object if the pod doesn't exist. Possibly acting only if <namespace> is the same where nfd-gc itself is running (so that it doesn't need cluster-wide access to get/list all pods in all namespaces).

This would be a separate improvement in addiotion to #1551 (which didn't play out quite as I initially thought).

Why is this needed:

Better management of NRT objects. Potentially fewer stale objects in the cluster.

[ozhuraki]

/assign @ozhuraki

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[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Mark this issue as fresh with /remove-lifecycle rotten
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• Offer to help out with Issue Triage

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/lifecycle rotten