Remove RetryBackfillTraversalIds which is a 14.0 migration
What does this MR do and why?
This removes a background migration which was introduced by !62992 (merged) in 14.0.
Per https://docs.gitlab.com/ee/update/index.html#upgrading-to-a-new-major-version, it's mandatory to upgrade to the latest minor version before going to the next major one, so it's safe to remove all data migrations that were introduced in version previous to 15.0.0, since we're currently at version 15.7.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Edited by Rémy Coutable