Network Endpoint Group (NEG) pre-provisioning is now available in Preview

## Feature Feature Network Endpoint Group (NEG) pre-provisioning is now available in Preview. With this feature, you can force the creation of empty zonal `GCE_VM_IP_PORT` NEGs in specified zones (or all zones within a region) during Service creation, regardless of whether the cluster has nodes in those zones. By extending the`cloud.google.com/neg` Service annotation with a custom zones parameter, you can seamlessly automate infrastructure deployments (such as attaching NEGs to backend services) without waiting for workloads to deploy. For more information, see [Pre-provisioning empty NEGs](https://cloud.google.com/kubernetes-engine/docs/how-to/standalone-neg#pre-provisioning).