The DAGs main page has All/Active/Paused.

It would be nice if we can have also Running Now which will show all the DAGs that have at least 1 in Running of DAG runs:
![Screen Shot 2021-08-25 at 11 30 55](https://user-images.githubusercontent.com/62940116/130756490-647dc664-7528-4eb7-b4d8-515577f7e6bb.png)


For the above example the new DAGs tab of Running Now should show only 2 rows.
The use case is to see easily what DAGs are currently in progress.

"""Redirect from url param."""
        return redirect(url_for("Airflow.audit_log", **sanitize_args(request.args)))
    @expose("/dags/<string:dag_id>/audit_log")
    @auth.has_access(
        [
            (permissions.ACTION_CAN_READ, permissions.RESOURCE_DAG),
            (permissions.ACTION_CAN_READ, permissions.RESOURCE_AUDIT_LOG),
        ]
    )
    @provide_session
    def audit_log(self, dag_id: str, session: Session = NEW_SESSION):
        dag = get_airflow_app().dag_bag.get_dag(dag_id, session=session)
        dag_model = DagModel.get_dagmodel(dag_id, session=session)
        if not dag:
            flash(f'DAG "{dag_id}" seems to be missing from DagBag.', "error")
            return redirect(url_for("Airflow.index"))
        included_events_raw = conf.get("webserver", "audit_view_included_events", fallback=None)
        excluded_events_raw = conf.get("webserver", "audit_view_excluded_events", fallback=None)
        query = session.query(Log).filter(Log.dag_id == dag_id)
        if included_events_raw:
            included_events = {event.strip() for event in included_events_raw.split(",")}
            query = query.filter(Log.event.in_(included_events))
        elif excluded_events_raw:
            excluded_events = {event.strip() for event in excluded_events_raw.split(",")}
            query = query.filter(Log.event.notin_(excluded_events))
        current_page = request.args.get("page", default=0, type=int)
        arg_sorting_key = request.args.get("sorting_key", "dttm")
        arg_sorting_direction = request.args.get("sorting_direction", default="desc")
        logs_per_page = PAGE_SIZE
        audit_logs_count = query.count()