code: def autoclean_username():
      _delete_user(username=EXAMPLE_USER_NAME)
      yield EXAMPLE_USER_NAME
      _delete_user(username=EXAMPLE_USER_NAME)
  
imports: from __future__ import annotations
  from unittest import mock
  import pytest
  from airflow.auth.managers.base_auth_manager import BaseAuthManager
  from airflow.providers.fab.auth_manager.models import Role, User
  from airflow.security import permissions
  from airflow.utils import timezone
  from airflow.utils.session import create_session
  from airflow.www.security import EXISTING_ROLES
  from tests.test_utils.api_connexion_utils import create_role, create_user, delete_role, delete_user
label_desc: Use image node_id 4 for calling a global function with example usage: autoclean_username() without return types