OperatorServiceStubsOptions.validateAndBuildWithDefaults not carrying over grpcMetadataProvider from WorkflowService

[tsurdilo]

If in WorkflowService we define grpcMetadataProvider

WorkflowServiceStubsOptions options = WorkflowServiceStubsOptions.newBuilder()
    .setTarget(serverAddress)
    .addGrpcMetadataProvider(new AuthorizationGrpcMetadataProvider(tokenSupplier))
    .build();
var service = WorkflowServiceStubs.newServiceStubs(options);

Then create operator service via typcal

  OperatorServiceStubsOptions operatorServiceStubsOptions =
      OperatorServiceStubsOptions.newBuilder()
          .setChannel(service.getRawChannel())
          .validateAndBuildWithDefaults();
  var operatorStub = OperatorServiceStubs.newServiceStubs(operatorServiceStubsOptions).blockingStub();

created operator service does not carry over grpc metadata from service used
user has to explicitly set again:

    OperatorServiceStubsOptions operatorServiceStubsOptions =
      OperatorServiceStubsOptions.newBuilder()
          .setChannel(service.getRawChannel())
          .addGrpcMetadataProvider(new AuthorizationGrpcMetadataProvider(tokenSupplier))
          .validateAndBuildWithDefaults();

request is to carry over this info in ServiceStubOptions.validateAndBuildWithDefaults if possible.