node-feature-discovery

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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.