Add ActivityPub to extra allowed labels in mr label
What does this MR do and why?
We are currently planning some work around ActivityPub. One of our community contributor @oelmekki who initiated this and is actively working on it cannot add this label to his work which make them hard to track. See: gitlab-org/gitlab!132460 (comment 1577288850)
This MR would allow him and other eventual contributors to add this label freely to their work.