Allow migrating from deleted variants #72717
Merged
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Summary
Bugfixes "Fix migrating from item variants when the variant has been deleted"
Purpose of change
Fixes #72607
Fixes #72602
Describe the solution
On loading a variant that is not a possible variant from the given item, try to search for a migration from that item with the variant that was loaded, and apply that migration if relevant.
Moved some code around so as to not duplicate it, which makes up most of the diff.
Also added a migration to fix #72602
Testing
Follow steps in #72607.