Prevent querying AI provider on rollback

Problem/Motivation

We have observed that when a migration is rolled back, the AiMigrator is run. If the cache has been cleared since the last import, then the AiMigrator will actually query the AI provider. This is both inefficient and expensive.

Please find and implement a way to prevent this from occurring on rollback. Ideally, none of the AiMigrator would run on rollback.