fix: common PVC cleanup job to be assigned to a correct node

[akurinnoy]

What does this PR do?

This pull request enhances the common PVC cleanup job by adding node affinity rule.

This change modifies the cleanup job creation logic to:

1. Read the volume.kubernetes.io/selected-node annotation from the common PVC associated with the DevWorkspace.
2. If the annotation exists, add a requiredDuringSchedulingIgnoredDuringExecution node affinity rule to the cleanup job's pod spec, targeting the specified node.

This ensures that the cleanup job pod runs on the same node as the volume. If the annotation is not present, no node affinity is added.

What issues does this PR fix or reference?

resolves #1269

Is it tested? How?

1. Create at least two DevWorkspaces; at least one should be running.
2. Verify that the PVC has the volume.kubernetes.io/selected-node annotation. Note the node name specified in the annotation value.

   kubectl get pvc -n <namespace> claim-devworkspace -o jsonpath='{.metadata.annotations.volume\.kubernetes\.io/selected-node}'

3. Delete a DevWorkspace, and leave at least one running DevWorkspace untouched.
4. Inspect the cleanup job to verify that the node affinity rule was added:

   kubectl get job -n <namespace> <job-name> -o jsonpath='{.spec.template.spec.affinity.nodeAffinity}'

   Check that the nodeSelectorTerms target the node name noted in step 2 via the kubernetes.io/hostname key.
5. Ensure the cleanup Job completes successfully and the DevWorkspace is deleted.

PR Checklist

• E2E tests pass (when PR is ready, comment /test v8-devworkspace-operator-e2e, v8-che-happy-path to trigger)
  • v8-devworkspace-operator-e2e: DevWorkspace e2e test
  • v8-che-happy-path: Happy path for verification integration with Che

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[dkwon17]

/retest

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: akurinnoy, dkwon17, rohanKanojia

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[dkwon17]

@akurinnoy I've tested on a single node and multi node cluster, I just have one small suggestion

[openshift-ci]

New changes are detected. LGTM label has been removed.

[dkwon17]

Thank you @akurinnoy , please squash and merge