**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.log.info("Starting the scheduler")
        
        pickle_dags = self.do_pickle and self.executor_class not in UNPICKLEABLE_EXECUTORS
        self.log.info("Processing each file at most %s times", self.num_times_parse_dags)
        
        
        async_mode = not self.using_sqlite
        processor_timeout_seconds: int = conf.getint('core', 'dag_file_processor_timeout')
        processor_timeout = timedelta(seconds=processor_timeout_seconds)
        self.processor_agent = DagFileProcessorAgent(
            dag_directory=self.subdir,
            max_runs=self.num_times_parse_dags,
            processor_factory=type(self)._create_dag_file_processor,
            processor_timeout=processor_timeout,