Feature: Teardown step for all tests

[soenkeliebau]

Problem

The dominant, platform-independent cause of the IT teardown-timeouts is a Kubernetes
namespace-deletion race: when kuttl runs kubectl delete namespace, the StatefulSet controller
recreates a Pod that GC removed while its StatefulSet was still active. The recreated Pod wedges on
generic-ephemeral-volume PVC ownership and/or the listener/secret CSI mount and holds
kubernetes.io/pvc-protection, so the namespace stays Terminating until the step times out.

The fix that removes this race is to stop the StatefulSets before the namespace is
deleted - but adding that step to every test by hand is unnecessary overhead and we want to avoid this.

Proposal

Add a single shared teardown step (via the beku shared/ directory from #1) that runs before
kuttl deletes the namespace:

1. Delete all SDP custom resources in the namespace dynamically —
   kubectl api-resources --verbs=delete --namespaced -o name | grep '\.stackable\.tech' → delete
   each. Product-agnostic; no per-operator hardcoding.
2. Wait for the StatefulSets to be gone (so nothing is recreated during namespace deletion).
3. Force-delete any lingering Pods (--grace-period=0 --force) so we don't wait out long termination
   grace periods.

depends on stackabletech/beku.py#40

[razvan]

kubectl api-resources --verbs=delete --namespaced -o name | grep '.stackable.tech' → delete

If zookeeper is deleted first, deleting hdfs, hbase, etc. is going to take a lot longer and we might still run into timeouts

[soenkeliebau]

kubectl api-resources --verbs=delete --namespaced -o name | grep '.stackable.tech' → delete

If zookeeper is deleted first, deleting hdfs, hbase, etc. is going to take a lot longer and we might still run into timeouts

I'll create a PR with the script in a second, then we can discuss there. If we can come up with a sensible order to do things in, that can be added to the script of course. Otherwise I'd say after the wait is expired the force delete of all pods should catch those stragglers?

[soenkeliebau]

PR with teardown script up: #607