Return a fully-qualified workflow_template string.

def workflow_template_path(cls, project, region, workflow_template):
        """Return a fully-qualified workflow_template string."""
        return google.api_core.path_template.expand(
            "projects/{project}/regions/{region}/workflowTemplates/{workflow_template}",
            project=project,
            region=region,
            workflow_template=workflow_template,
        )