Repro steps

1. create a new cluster, inside a regionalized group
2. Click "Add data" on the card that tells you you created a new cluster.
3. Add DB, collection, insert sample document. This will fail our regionalization UI audit and you'll get a 400.

Impact

There is actually no regionalization violation. Barely. "Database" and "collection" are not CSI for the purpose of regionalization so there is no compliance problem if they go to the wrong region. The data in insert document is CSI, but that request won't leave the FE unless the DB/coll request succeeds.

However, this feature is broken for the few regionalized customers. The workaround is to create the first database in that cluster any other way. Hence fixing it is low priority.