Change Details

- Tested incorrect `db.String` column and new buildkite check fails for it: https://buildkite.com/dagster/dagster-diffs/builds/13894

- bk - Added new schema check to prevent addition of new `db.String` fields. - Tested incorrect `db.String` column and new buildkite check fails for it: https://buildkite.com/dagster/dagster-diffs/builds/13894

- bk - Added new schema check to prevent addition of new `db.String` fields. - Tested incorrect `db.String` column and new buildkite check fails for it: https://buildkite.com/dagster/dagster-diffs/builds/13894