Remove columns_changing_default calls from User and UserPreference
What does this MR do and why?
!122467 (merged) and !122473 (merged) were merged in %16.1 and calls to columns_changing_default
can be removed in %16.2.
These calls should be removed in the next minor release according to our guidelines https://docs.gitlab.com/ee/development/database/avoiding_downtime_in_migrations.html#clean-up-the-safelychangecolumndefault-concern-in-the-next-minor-release.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Related to #382704 (closed)