**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
include_examples=False,
            read_dags_from_db=False,
        )
        dagbag.bag_dag(dag=dag, root_dag=dag)
        
        DAG.bulk_write_to_db(dagbag.dags.values())
        dag_model = DagModel.get_dagmodel(dag.dag_id)
        
        assert dag_model.next_dagrun == DEFAULT_DATE
        dag = SerializedDAG.from_dict(SerializedDAG.to_dict(dag))
        dagrun = dag.create_dagrun(
            run_type=DagRunType.SCHEDULED,
            execution_date=dag_model.next_dagrun,
            start_date=timezone.utcnow(),
            state=State.RUNNING,
            external_trigger=False,
            session=session,
            creating_job_id=2,
        )
        session.flush()
        assert dag.get_last_dagrun(session) == dagrun
        scheduler = SchedulerJob(subdir=os.devnull, executor=self.null_exec)
        scheduler.dagbag = dagbag
        scheduler.processor_agent = mock.MagicMock()
        
        scheduler._create_dag_runs([dag_model], session)
        
        assert dag_model.next_dagrun == DEFAULT_DATE + timedelta(days=1)
        session.rollback()
    def test_do_schedule_max_active_runs_upstream_failed(self):