feat: add API to enable Provisioning Request API on existing nodepools

---
feat: Promoted enable_confidential_storage to GA (behind allowlist)

PiperOrigin-RevId: 609154511

google/container/v1/cluster_service.proto

@@ -832,6 +832,10 @@ message NodeConfig {
 
   // A map of resource manager tag keys and values to be attached to the nodes.
   ResourceManagerTags resource_manager_tags = 45;
+
+  // Optional. Reserved for future use.
+  bool enable_confidential_storage = 46
+      [(google.api.field_behavior) = OPTIONAL];
 }
 
 // Specifies options for controlling advanced machine features.
@@ -2763,6 +2767,9 @@ message UpdateNodePoolRequest {
   // for managing Compute Engine firewalls using Network Firewall Policies.
   // Existing tags will be replaced with new values.
   ResourceManagerTags resource_manager_tags = 39;
+
+  // Specifies the configuration of queued provisioning.
+  NodePool.QueuedProvisioning queued_provisioning = 42;
 }
 
 // SetNodePoolAutoscalingRequest sets the autoscaler settings of a node pool.