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.

"""
    Cast the task_duration to an int was for optimization for large/huge dags if task_duration > 10s
    otherwise we keep it as a float with 3dp.
    """
    return int(task_duration) if task_duration > 10.0 else round(task_duration, 3)
def sanitize_args(args: dict[str, str]) -> dict[str, str]:
    """
    Remove all parameters starting with `_`.
    :param args: arguments of request
    :return: copy of the dictionary passed as input with args starting with `_` removed.
    """
    return {key: value for key, value in args.items() if not key.startswith("_")}
def get_safe_url(url):
    """Given a user-supplied URL, ensure it points to our web server."""
    if not url:
        return url_for("Airflow.index")
    
    
    if ";" in unquote(url):
        return url_for("Airflow.index")
    host_url = urlsplit(request.host_url)
    redirect_url = urlsplit(urljoin(request.host_url, url))
    if not (redirect_url.scheme in ("http", "https") and host_url.netloc == redirect_url.netloc):
        return url_for("Airflow.index")
    
    return redirect_url.geturl()
def get_date_time_num_runs_dag_runs_form_data(www_request, session, dag):