Ensure that this works:

```python
@setup
def mytask():
    print("I am a setup task")

with dag_maker() as dag:
    mytask.override(task_id='newtask')

assert len(dag.task_group.children) == 1
setup_task = dag.task_group.children["newtask"]
assert setup_task._is_setup
```
and teardown also works
Union,
    cast,
)
import attr
import pendulum
from dateutil.relativedelta import relativedelta
from sqlalchemy.orm import Session
from sqlalchemy.orm.exc import NoResultFound
from airflow.configuration import conf
from airflow.exceptions import AirflowException, RemovedInAirflow3Warning, TaskDeferred
from airflow.lineage import apply_lineage, prepare_lineage
from airflow.models.abstractoperator import (
    DEFAULT_IGNORE_FIRST_DEPENDS_ON_PAST,
    DEFAULT_OWNER,
    DEFAULT_POOL_SLOTS,
    DEFAULT_PRIORITY_WEIGHT,
    DEFAULT_QUEUE,
    DEFAULT_RETRIES,
    DEFAULT_RETRY_DELAY,
    DEFAULT_TASK_EXECUTION_TIMEOUT,
    DEFAULT_TRIGGER_RULE,
    DEFAULT_WAIT_FOR_PAST_DEPENDS_BEFORE_SKIPPING,
    DEFAULT_WEIGHT_RULE,
    AbstractOperator,
    TaskStateChangeCallback,
)
from airflow.models.mappedoperator import OperatorPartial, validate_mapping_kwargs
from airflow.models.param import ParamsDict
from airflow.models.pool import Pool
from airflow.models.taskinstance import TaskInstance, clear_task_instances