fix(observability): 🐛 disable crds.cleanup hook in victoria-metrics-operator

Pre-upgrade cleanup hook uses bitnami/kubectl and spawns on every ArgoCD
sync. Dev cluster nodes are at 99% CPU / pod limit — hook pod cannot be
scheduled, blocking the entire sync indefinitely.

Disabling cleanup.enabled prevents the hook Job from being created.
CRD cleanup is safe to skip on a fresh bootstrap where no old CRDs exist.

otc/dev.t09.de/stacks/observability/victoria-k8s-stack/values.yaml

@@ -28,10 +28,7 @@ victoria-metrics-operator:
   crds:
     plain: true
     cleanup:
-      enabled: true
+      enabled: false  # disabled: cleanup hook can't schedule on resource-constrained nodes (Insufficient cpu / Too many pods)
-      image:
-        repository: bitnami/kubectl
-        pullPolicy: IfNotPresent
   serviceMonitor:
     enabled: true
   operator: