**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
date = dag.following_schedule(date)
        dr2 = dag.create_dagrun(
            run_type=DagRunType.SCHEDULED,
            execution_date=date,
            state=State.RUNNING,
        )
        date = dag.following_schedule(date)
        dr3 = dag.create_dagrun(
            run_type=DagRunType.SCHEDULED,
            execution_date=date,
            state=State.RUNNING,
        )
        
        assert dr1 is not None
        assert dr2 is not None
        assert dr3 is not None
        assert len(DagRun.find(dag_id=dag.dag_id, state=State.RUNNING, session=session)) == 3
        
        dag.max_active_runs = 1
        
        
        with create_session() as session:
            num_scheduled = scheduler._schedule_dag_run(dr1, set(), session)
            assert num_scheduled == 1
            num_scheduled = scheduler._schedule_dag_run(dr2, {dr1.execution_date}, session)
            assert num_scheduled == 0
            num_scheduled = scheduler._schedule_dag_run(dr3, {dr1.execution_date}, session)
            assert num_scheduled == 0
    @patch.object(TaskInstance, 'handle_failure_with_callback')
    def test_execute_on_failure_callbacks(self, mock_ti_handle_failure):