Fix existing system notes for Issue task updates
In #368028 (closed) we migrated to a new format on system notes generated when checking and unchecking task list items on issue descriptions.
We need to run a migration to fix all notes that were created before !94136 (merged)
After wards we need to remove some overridden methods (#369923 (closed))
- Details in #369930 (comment 1102403527)
- Time to create temp index: 25.7min
Edited by Mario Celi