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.

num_of_pages = int(math.ceil(audit_logs_count / float(logs_per_page)))
        start = current_page * logs_per_page
        end = start + logs_per_page
        sort_column = Log.__table__.c.get(arg_sorting_key)
        if sort_column is not None:
            if arg_sorting_direction == "desc":
                sort_column = sort_column.desc()
            query = query.order_by(sort_column)
        dag_audit_logs = query.offset(start).limit(logs_per_page).all()
        return self.render_template(
            "airflow/dag_audit_log.html",
            dag=dag,
            dag_model=dag_model,
            root=request.args.get("root"),
            dag_id=dag_id,
            dag_logs=dag_audit_logs,
            num_log_from=min(start + 1, audit_logs_count),
            num_log_to=min(end, audit_logs_count),
            audit_logs_count=audit_logs_count,
            page_size=PAGE_SIZE,
            paging=wwwutils.generate_pages(
                current_page,
                num_of_pages,
                sorting_key=arg_sorting_key if arg_sorting_key else None,
                sorting_direction=arg_sorting_direction if arg_sorting_direction else None,
            ),
            sorting_key=arg_sorting_key,
            sorting_direction=arg_sorting_direction,
        )
class ConfigurationView(AirflowBaseView):