Prevent CI schema from diverging with main database

In !64289 (merged) we introduced a new migration directory and new schema file for CI database. The CI migrations are always meant to run in the main database as well. We want to ensure that the following does not happen:

1. Somebody adds a migration in db/migrate that changes any of the CI tables
2. Somebody makes a schema change to CI tables and they are not added to db/structure.sql somehow