Add owner reference for NRT objects created by topology-updater

[marquiz]

What would you like to be added:

We previously (in v0.15) enabled owner references in NodeFeature objects created by nfd-worker. We could do the same with nfd-topology-updater and NodeResourceTopology objects. Setting the owner reference enables automatic garbage-collection of orphaned NodeResourceTopology objects (i.e. whose owner topology-updater pod has gone) by Kubernetes

Why is this needed:

Automatic garbage-collection of NodeResourceTopology objects e.g. when the nfd-topology-updater is undeployed.

[ozhuraki]

/assign @ozhuraki

[marquiz]

I didn't realize that this doesn't work similarly with cluster-scoped resources. Cluster-scoped objects referencing
namespaced owners do not get GC'd, but create a warning instead (https://kubernetes.io/docs/concepts/architecture/garbage-collection).

We could set the nfd ns in the ownerReference to get a bit better GC behavior