Change the default DB shard from 5 to 7 for new Admax Accounts

This would be a UI change in Admax to set the default shard to 7 when a new account is created.

We also need to change the default warehouse shard to 9.

This query can be used to verify the change made it to production:

select changeTime, accountID, description, databaseInstance, warehouseInstance from accounts join logging.accountChanges on accountID=id and `column`='description' and oldValue='(row inserted)' order by id desc limit 10;