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
self.validate_deserialized_dag(json_dag, dag)
        serialized_dag = SerializedDAG.deserialize_dag(SerializedDAG.serialize_dag(dag))
        self.assert_taskgroup_children(
            serialized_dag.task_group, dag.task_group, {"setup", "teardown", "group1"}
        )
        self.assert_task_is_setup_teardown(serialized_dag.task_group.children["setup"], is_setup=True)
        self.assert_task_is_setup_teardown(serialized_dag.task_group.children["teardown"], is_teardown=True)
        se_first_group = serialized_dag.task_group.children["group1"]
        dag_first_group = dag.task_group.children["group1"]
        self.assert_taskgroup_children(
            se_first_group,
            dag_first_group,
            {"group1.setup1", "group1.task1", "group1.group2", "group1.teardown1"},
        )
        self.assert_task_is_setup_teardown(se_first_group.children["group1.setup1"], is_setup=True)
        self.assert_task_is_setup_teardown(se_first_group.children["group1.task1"])
        self.assert_task_is_setup_teardown(se_first_group.children["group1.teardown1"], is_teardown=True)
        se_second_group = se_first_group.children["group1.group2"]
        dag_second_group = dag_first_group.children["group1.group2"]
        self.assert_taskgroup_children(
            se_second_group,
            dag_second_group,
            {"group1.group2.setup2", "group1.group2.task2", "group1.group2.teardown2"},
        )
        self.assert_task_is_setup_teardown(se_second_group.children["group1.group2.setup2"], is_setup=True)
        self.assert_task_is_setup_teardown(se_second_group.children["group1.group2.task2"])
        self.assert_task_is_setup_teardown(
            se_second_group.children["group1.group2.teardown2"], is_teardown=True
        )
    def test_teardown_task_on_failure_fail_dagrun_serialization(self, dag_maker):