Session affinity support using GCPTrafficDistributionPolicy for GKE Gateway is

## Feature Feature Session affinity support using GCPTrafficDistributionPolicy for GKE Gateway is generally available. This release currently supports single-cluster GKE Gateway load balancers using the following GatewayClasses: * `gke-l7-rilb` * `gke-l7-regional-external-managed` * `gke-l7-global-external-managed` In addition to the session affinity types available in Preview, you can now use the `STRONG_COOKIE_AFFINITY` type, which provides the most persistent session stickiness among the session affinity types available in Google Cloud Application Load Balancers. The session affinity types require the following minimum GKE versions: * `CLIENT_IP`, `HEADER_FIELD`, `GENERATED_COOKIE`, and `HTTP_COOKIE`: version 1.35.2-gke.1269001 or later * `STRONG_COOKIE_AFFINITY`: version 1.36.3-gke.1767000 or later For more information, see [Configure session affinity using GCPTrafficDistributionPolicy](https://docs.cloud.google.com/kubernetes-engine/docs/how-to/configure-gateway-resources#expanded-session-affinity).