**Description**

It would be great having a option to abort a DAG Runs through the REST API.

**Use case / motivation**

The proposed input params would be:
 - DAG_ID
 - DAG_RUN_ID

The DAG Run should abort all its tasks running and mark them as "failed".

**Are you willing to submit a PR?**

**Related Issues**


airflow/api_connexion/endpoints/dag_run_endpoint.py
query, end_date_gte, end_date_lte, execution_date_gte, execution_date_lte, start_date_gte, start_date_lte
):
    
    if start_date_gte:
        query = query.filter(DagRun.start_date >= start_date_gte)
    if start_date_lte:
        query = query.filter(DagRun.start_date <= start_date_lte)
    
    if execution_date_gte:
        query = query.filter(DagRun.execution_date >= execution_date_gte)
    if execution_date_lte:
        query = query.filter(DagRun.execution_date <= execution_date_lte)
    
    if end_date_gte:
        query = query.filter(DagRun.end_date >= end_date_gte)
    if end_date_lte:
        query = query.filter(DagRun.end_date <= end_date_lte)
    return query
@security.requires_access(
    [
        (permissions.ACTION_CAN_READ, permissions.RESOURCE_DAG),
        (permissions.ACTION_CAN_READ, permissions.RESOURCE_DAG_RUN),
    ]
)
@provide_session
def get_dag_runs_batch(session):