moved multi-query into deeper folder

removed 'regular' filter from API task list

add service monitor to monitoring page

monitor endpoint and database change

https://support.astron.nl/jira/browse/SDC-475

(and to read serializer, not yet to write serializer)

added /atdb/tasks/?predecessor__status=defining filter options to REST API

- adding job table
see https://support.astron.nl/jira/browse/SDC-142

skeleton for 'get_size' endpoint

- skip -> resume
- added task.metrics

This reverts merge request !1

adding CI/CD pipeline