The guidance for using proxy image types (default and distroless) with

## Feature Feature The guidance for using proxy image types (`default` and `distroless`) with Managed Cloud Service Mesh has been updated: * **Directly onboarded clusters** using the `TRAFFIC_DIRECTOR` implementation use `distroless` proxy images by default, and other image types are not supported. * **Migrated clusters** (migrated from `ISTIOD` to `TRAFFIC_DIRECTOR`) default to `default` images, but can opt in to `distroless` images via `MeshConfig` or the `sidecar.istio.io/proxyImageType: distroless` Pod annotation. For more information, see[Distroless proxy images](https://docs.cloud.google.com/service-mesh/docs/enable-optional-features-managed#distroless%5Fproxy%5Fimage)and[Identify the proxy image type used in the cluster](https://docs.cloud.google.com/service-mesh/docs/troubleshooting/troubleshoot-proxy#identify%5Fproxy%5Fimage%5Ftype).