Fix migration for removing orphaned issues.moved_to_id values in MySQL and PostgreSQL

Closes #41498

See merge request gitlab-org/gitlab-ce!16141

(cherry picked from commit ff3e9af6)

5cacdc4e Fix migration for removing orphaned issues.moved_to_id values in MySQL
dfdf22c7 Fix PostgreSQL implementation of migration
e97671b8 Simplify implementation and allow for batch updates in MySQL