Fixes#5691. Support gitlab forking_access_level, builds_access_level and container_registry_access_level fields (#5706)
* Fixes#5691. Support gitlab forking_access_level, builds_access_level and container_registry_access_level fields
* Add changelog fragment
* Fix revision issues
(cherry picked from commit 58eb495797)
Co-authored-by: Juan Antonio Valiño García <juanval@edu.xunta.es>