**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
scheduler = SchedulerJob(
                num_runs=1, executor=executor, subdir=os.path.join(settings.DAGS_FOLDER, "no_dags.py")
            )
            scheduler.heartrate = 0
            scheduler.run()
        do_schedule()  
        with create_session() as session:
            ti = (
                session.query(TaskInstance)
                .filter(
                    TaskInstance.dag_id == 'test_retry_still_in_executor',
                    TaskInstance.task_id == 'test_retry_handling_op',
                )
                .first()
            )
        ti.task = dag_task1
        def run_with_error(ti, ignore_ti_state=False):