Remove background migration for todo sanitization
In 15.6 we added a BG migration for todo sanitization which was not properly isolated (for complexity reason). Because the migration is not isolated, it would be good to remove it in 1-2 milestone to avoid the risk that migration would break when the code it uses changes.
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Remove todo sanitization migration -
add a migration note https://docs.gitlab.com/ee/update/#version-specific-upgrading-instructions, so users don't skip too many minor version upgrades
The following discussion from !87908 (merged) should be addressed:
Related to !87908 (comment 1170959416)
Edited by Jan Provaznik