Migrate approvals_before_merge column to a rule
What does this MR do?
Creates a migration for fallback rule presentation via actual rule instead of approvals_before_merge
column
Related issue: https://gitlab.com/gitlab-org/gitlab-ee/issues/11132
CE Backport: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/32705
Edited by Igor Drozdov