FAL-1509 support m2m fields for roles and skills
https://tasks.opencraft.com/browse/FAL-1509
Test instructions:
- see backend-app-course-search!4 (merged) and follow test instructions there.
- deploy this to the test sandbox to test the fixes for hosting on a subpath (I'll deploy this as assignee)
Reviewers:
Edited by Raul Gallegos