Prepare note_diff_files for bigint migration
What does this MR do and why?
In preparation of Swap note_diff_files.diff_note_id to bigint (!115460 - merged) we need to validate FK asynchronously as it takes approx. 8 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.
See #392815 (closed).
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How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
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