Add lock_on_merge column for labels table (redux)
What does this MR do and why?
Adds a lock_on_merge
boolean column to the labels
table. This is one part of the implementation of https://gitlab.com/gitlab-org/gitlab/-/issues/408676+
The original MR had to be nullified due to a problem during deployment. See Mixed deployment issue: Column added on `labels... (#421145 - closed)
Once Override attributes to include known column nam... (!128578 - merged) is merged, we can re-attempt the migration.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Edited by Brett Walker