**Apache Airflow version**:

1.10.12

**What happened**:

I created dag with dagrun_timeout=2 minutes. 

After 2 minutes dagrun is marked as failed and the next one is started, but task keeps going.

**What you expected to happen**:

Task is killed with dag run as it is done when you mark dagrun failed manually.

**How to reproduce it**:
```
dag = DAG(dag_id='platform.airflow-test',
          description='',
          schedule_interval="0 0 * * *",
          start_date=datetime(2020, 7, 1),
          max_active_runs=1,
          catchup=True,
          dagrun_timeout=timedelta(minutes=2))

run_this = BashOperator(
    task_id='run_after_loop',
    bash_command=' for((i=1;i<=600;i+=1)); do echo "Welcome $i times"; sleep 1;  done',
    dag=dag,
)
```
tests/jobs/test_scheduler_job.py
with mock.patch.object(settings, "STORE_DAG_CODE", False):
            scheduler.dagbag.bag_dag(dag, root_dag=dag)
            scheduler.dagbag.sync_to_db()
        session = settings.Session()
        orm_dag = session.query(DagModel).get(dag.dag_id)
        assert orm_dag is not None
        
        scheduler._create_dag_runs([orm_dag], session)
        drs = DagRun.find(dag_id=dag.dag_id, session=session)
        assert len(drs) == 1
        dr = drs[0]
        ti = dr.get_task_instance('dummy')
        ti.set_state(state, session)
        scheduler._schedule_dag_run(dr, {}, session)
        expected_callback = DagCallbackRequest(
            full_filepath=dr.dag.fileloc,
            dag_id=dr.dag_id,
            is_failure_callback=bool(state == State.FAILED),
            execution_date=dr.execution_date,
            msg=expected_callback_msg,
        )
        
        scheduler.processor_agent.send_callback_to_execute.assert_called_once_with(expected_callback)
        
        
        scheduler._send_sla_callbacks_to_processor.assert_called_once_with(dag)
        session.rollback()
        session.close()
    @parameterized.expand([(State.SUCCESS,), (State.FAILED,)])
    def test_dagrun_callbacks_are_not_added_when_callbacks_are_not_defined(self, state):