Disable scripts/regenerate-schema in CI

This script has a lot of edge cases it needs to handle, so let's
disable it for now.

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/216519

.gitlab/ci/rails.gitlab-ci.yml

@@ -145,7 +145,6 @@ db:check-schema:
     - .db-job-base
     - .rails:rules:ee-mr-and-master-only
   script:
-    - scripts/regenerate-schema
     - source scripts/schema_changed.sh
 
 db:migrate-from-v11.11.0: