Add clean-up phase for merge request assignees background migration
Follow up of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/26496:
-
Execute existing on-going background migrations (https://docs.gitlab.com/ee/development/background_migrations.html#cleaning-up) -
Ignore column MergeRequest#assignee_id
-
Deleted belongs_to :assignee
fromMergeRequest
model -
Delete feature flag
Edited by Igor Drozdov