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
from airflow.models.taskmixin import DAGNode, DependencyMixin
from airflow.serialization.enums import DagAttributeTypes
from airflow.ti_deps.deps.base_ti_dep import BaseTIDep
from airflow.ti_deps.deps.not_in_retry_period_dep import NotInRetryPeriodDep
from airflow.ti_deps.deps.not_previously_skipped_dep import NotPreviouslySkippedDep
from airflow.ti_deps.deps.prev_dagrun_dep import PrevDagrunDep
from airflow.ti_deps.deps.trigger_rule_dep import TriggerRuleDep
from airflow.triggers.base import BaseTrigger
from airflow.utils import timezone
from airflow.utils.context import Context
from airflow.utils.decorators import fixup_decorator_warning_stack
from airflow.utils.helpers import validate_key
from airflow.utils.operator_resources import Resources
from airflow.utils.session import NEW_SESSION, provide_session
from airflow.utils.setup_teardown import SetupTeardownContext
from airflow.utils.trigger_rule import TriggerRule
from airflow.utils.weight_rule import WeightRule
from airflow.utils.xcom import XCOM_RETURN_KEY
if TYPE_CHECKING:
    import jinja2  
    from airflow.models.dag import DAG
    from airflow.models.taskinstance import TaskInstanceKey
    from airflow.models.xcom_arg import XComArg
    from airflow.utils.task_group import TaskGroup
ScheduleInterval = Union[str, timedelta, relativedelta]
TaskPreExecuteHook = Callable[[Context], None]
TaskPostExecuteHook = Callable[[Context, Any], None]
T = TypeVar("T", bound=FunctionType)
logger = logging.getLogger("airflow.models.baseoperator.BaseOperator")
def parse_retries(retries: Any) -> int | None: