Prepare merge_request_user_mentions for bigint migration
What does this MR do and why?
In preparation of Finalize conversion of merge_request_user_menti... (!113928 - merged) we need to validate a FK asynchronously as it take almost 7 hours to validate.
Async FK validation docs - https://docs.gitlab.com/ee/development/database/add_foreign_key_to_existing_column.html#validate-the-foreign-key-asynchronously.
Screenshots or screen recordings
Screenshots are required for UI changes, and strongly recommended for all other merge requests.
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
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Edited by Krasimir Angelov