@Override
  public OperationCallable<DeleteWorkstationClusterRequest, WorkstationCluster, OperationMetadata>
      deleteWorkstationClusterOperationCallable() {
    return deleteWorkstationClusterOperationCallable;
  }
Constructs an instance of GrpcWorkstationsStub, using the given settings. This is protected so
that it is easy to make a subclass, but otherwise, the static factory methods should be
preferred.
java-workstations/google-cloud-workstations/src/main/java/com/google/cloud/workstations/v1beta/stub/GrpcWorkstationsStub.java