**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
assert len(scheduler.dagbag.dags.get("test_verify_integrity_if_dag_changed").tasks) == 1
        
        BashOperator(task_id='bash_task_1', dag=dag, bash_command='echo hi')
        SerializedDagModel.write_dag(dag=dag)
        dag_version_2 = SerializedDagModel.get_latest_version_hash(dr.dag_id, session=session)
        assert dag_version_2 != dag_version_1
        scheduled_tis = scheduler._schedule_dag_run(dr, {}, session)
        session.flush()
        assert scheduled_tis == 2
        drs = DagRun.find(dag_id=dag.dag_id, session=session)
        assert len(drs) == 1
        dr = drs[0]
        assert dr.dag_hash == dag_version_2
        assert scheduler.dagbag.dags == {'test_verify_integrity_if_dag_changed': dag}
        assert len(scheduler.dagbag.dags.get("test_verify_integrity_if_dag_changed").tasks) == 2
        tis_count = (
            session.query(func.count(TaskInstance.task_id))
            .filter(
                TaskInstance.dag_id == dr.dag_id,
                TaskInstance.execution_date == dr.execution_date,
                TaskInstance.state == State.SCHEDULED,
            )
            .scalar()
        )
        assert tis_count == 2
        latest_dag_version = SerializedDagModel.get_latest_version_hash(dr.dag_id, session=session)
        assert dr.dag_hash == latest_dag_version
        session.rollback()
        session.close()
    def test_retry_still_in_executor(self):