**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,
)
```
airflow/jobs/scheduler_job.py
self, dagbag: DagBag, callback_requests: List[CallbackRequest], session: Session = None
    ) -> None:
        """
        Execute on failure callbacks. These objects can come from SchedulerJob or from
        DagFileProcessorManager.
        :param dagbag: Dag Bag of dags
        :param callback_requests: failure callbacks to execute
        :type callback_requests: List[airflow.utils.callback_requests.CallbackRequest]
        :param session: DB session.
        """
        for request in callback_requests:
            self.log.debug("Processing Callback Request: %s", request)
            try:
                if isinstance(request, TaskCallbackRequest):
                    self._execute_task_callbacks(dagbag, request)
                elif isinstance(request, SlaCallbackRequest):
                    self.manage_slas(dagbag.dags.get(request.dag_id))
                elif isinstance(request, DagCallbackRequest):
                    self._execute_dag_callbacks(dagbag, request, session)
            except Exception:  
                self.log.exception(
                    "Error executing %s callback for file: %s",
                    request.__class__.__name__,
                    request.full_filepath,
                )
        session.commit()
    @provide_session
    def _execute_dag_callbacks(self, dagbag: DagBag, request: DagCallbackRequest, session: Session):