Create DB page: get Users for all DBs in single query

Version 1.62.5

Bugfix
Finished

When creating a new DB, DA offers Users to create it using an existing account. All Users for all DBs under this User are listed. If there are many DBs, this can take time to get the list of Users for each DB. This change makes one single call using a LIKE username_% condition, allowing a much faster result list. ---- T33942

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