GKE support for using the c3-standard-*-lssd machine types as Confidential

## Feature Feature GKE support for using the `c3-standard-*-lssd` machine types as Confidential GKE Nodes with Intel TDX is generally available. For more information, see the following: * To use this feature with GKE, see [Encrypt workload data in-use with Confidential GKE Nodes](https://docs.cloud.google.com/kubernetes-engine/docs/how-to/confidential-gke-nodes). * To learn more about the feature from Compute Engine, see [Confidential VM overview](https://docs.cloud.google.com/confidential-computing/confidential-vm/docs/confidential-vm-overview). * To see supported configurations, including machine support, see[Supported configurations](https://docs.cloud.google.com/confidential-computing/confidential-vm/docs/supported-configurations) and its "Machine types, CPUs, and zones" section.