feat: added DevWorkspace pruner

[akurinnoy]

What does this PR do?

This PR adds a DevWorkspace pruner that uses a CronJob to periodically identify and delete DevWorkspaces that have been inactive for a specified duration.

What issues does this PR fix or reference?

resolves #1376

Is it tested? How?

1. Deploy the operator with this new code.
2. Ensure that the DevWorkspaceOperatorConfig initially does not have pruning enabled by default:
   • there is no CleanupCronJob section in the config.workspace section of the DWOC
   • or, if a CleanupCronJob is present in config.workspace, verify that enable: false.
3. Create several DevWorkspaces in various states: started and stopped.
4. Patch the DevWorkspaceOperatorConfig to enable pruning and set parameters:

   kubectl patch DevWorkspaceOperatorConfig devworkspace-operator-config \
     -n <operator-namespace> \
     --type=merge \
     -p '{"config": {"workspace": {"cleanupCronJob": {"enable": true, "retainTime": 60, "image": "image-registry.openshift-image-registry.svc:5000/openshift/cli:latest"}}}}'

   • Make sure to use an image": "..." with the correct oc image path on your cluster.
5. Patch the CronJob to schedule the pruning every 1 minute:

   kubectl patch CronJob devworkspace-pruner \
     -n <operator-namespace> \
     --type=merge \
     -p '{"spec":{"schedule":"* * * * *"}}'

6. Wait for the CronJob to run (at least 1 minute).
7. Verify that the correct DevWorkspaces are deleted:
   • Use kubectl get devworkspaces -A to check which DevWorkspaces are present. Only DevWorkspaces that should not be deleted should exist.
   • Inspect the CronJob's logs (kubectl logs -l job-name=<pruner-cronjob-name> -n <operator-namespace>) to confirm that the pruner script is running and identifying the correct DevWorkspaces for deletion.
   • Inspect the ConfigMap and confirm that the script exists there
8. Disable pruning and verify the CronJob is suspended:
   • Patch the DevWorkspaceOperatorConfig to disable pruning:

     kubectl patch DevWorkspaceOperatorConfig devworkspace-operator-config \
       -n <operator-namespace> \
       --type=merge \
       -p '{"config": {"workspace": {"cleanupCronJob": {"enable": false}}}}'

   • Verify that the CronJob's suspend field is set to true:

     kubectl get cronjob devworkspace-pruner -n <operator-namespace> -o jsonpath='{.spec.suspend}'

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

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: akurinnoy
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