**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
execution_date = DEFAULT_DATE
        dag_id = "dag_id"
        task_id = "task_id"
        try_number = 42
        executor = MagicMock()
        scheduler = SchedulerJob(executor=executor)
        scheduler.processor_agent = MagicMock()
        event_buffer = {TaskInstanceKey(dag_id, task_id, execution_date, try_number): (State.SUCCESS, None)}
        executor.get_event_buffer.return_value = event_buffer
        dag = DAG(dag_id=dag_id, start_date=DEFAULT_DATE)
        task = DummyOperator(dag=dag, task_id=task_id)
        with create_session() as session:
            ti = TaskInstance(task, DEFAULT_DATE)
            ti.state = State.SUCCESS
            session.merge(ti)
        scheduler._process_executor_events()
        
        
        assert event_buffer == {}
    def test_execute_task_instances_is_paused_wont_execute(self):