REFACTOR(resources): remove cpu limits

- to prevent throttling
Removed CPU limits from all infrastructure components while keeping
memory limits for protection:

- cnpg: removed 500m CPU limit
- external-secrets: removed 200m, 100m CPU limits (operator, webhook,
  certController)
- falco: removed 500m CPU limit (falcosidekick webui)
- vault: removed 500m CPU limit
- velero: removed 500m, 1000m CPU limits (server, node-agent)

Benefits:
- ✅ Prevents CPU throttling
- ✅ Better performance and lower latency
- ✅ More efficient resource utilization
- ✅ Simpler management (only requests to tune)

Memory limits are kept to prevent memory leaks and OOM issues.

postgresql-dev/helm-values/postgresql-dev.yaml

@@ -26,6 +26,9 @@ resources:
   requests:
     memory: "256Mi"
     cpu: "30m"  # Reduced to 30% of original (100m -> 30m)
+  limits:
+    # cpu: removed to prevent throttling
+    memory: "1Gi"
 
 metrics:
   enabled: false