Add pipeline stages position clean-up migration
What does this MR do?
This merge request implements pipeline stages position migration clean-up. We also need to bump import/export version to avoid unmigrated data being imported.
Does this MR meet the acceptance criteria?
-
Changelog entry added -
Tests added for this feature/bug -
Has been reviewed by a Backend maintainer -
Has been reviewed by a Database specialist
What are the relevant issue numbers?
Closes gitlab-org/gitlab-ce#45956
Edited by Grzegorz Bizon