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.

"""Multiple delete."""
        self.datamodel.delete_all(items)
        self.update_redirect()
        return redirect(self.get_redirect())
    @action("set_queued", "Set state to 'queued'", "", single=False)
    @action_has_dag_edit_access
    @action_logging
    def action_set_queued(self, drs: list[DagRun]):
        """Set state to queued."""
        return self._set_dag_runs_to_active_state(drs, State.QUEUED)
    @action("set_running", "Set state to 'running'", "", single=False)
    @action_has_dag_edit_access
    @action_logging
    def action_set_running(self, drs: list[DagRun]):