**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
"""
        DagRuns with one successful and one future root task -> SUCCESS
        Noted: the DagRun state could be still in running state during CI.
        """
        clear_db_dags()
        dag_id = 'test_dagrun_states_root_future'
        dag = self.dagbag.get_dag(dag_id)
        dag.sync_to_db()
        scheduler = SchedulerJob(num_runs=1, executor=self.null_exec, subdir=dag.fileloc)
        scheduler.run()
        first_run = DagRun.find(dag_id=dag_id, execution_date=DEFAULT_DATE)[0]
        ti_ids = [(ti.task_id, ti.state) for ti in first_run.get_task_instances()]
        assert ti_ids == [('current', State.SUCCESS)]
        assert first_run.state in [State.SUCCESS, State.RUNNING]
    def test_dagrun_deadlock_ignore_depends_on_past_advance_ex_date(self):