Remove unnecessary allowlist of cross-joins in migrations that pre-date moving to multiple databases

Since we validate cross-joins in all code in all specs then we find examples in migrations that will violate the cross-join rule. This is not really an issue since old migrations will need to be run before moving CI to a new database anyway because there are schema changes necessary for that.

As such we should come up with a solution to not require the allowlist in migrations before a certain migration number and go back and remove all the previous allowlist calls before that migration number.