Return a fully-qualified environment_session_entity_type string.

def environment_session_entity_type_path(cls, project, environment, user,
                                             session, entity_type):
        """Return a fully-qualified environment_session_entity_type string."""
        return google.api_core.path_template.expand(
            'projects/{project}/agent/environments/{environment}/users/{user}/sessions/{session}/entityTypes/{entity_type}',
            project=project,
            environment=environment,
            user=user,
            session=session,
            entity_type=entity_type,
        )