Improve UX: If key found on backend, return only the single region for that key
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3551184. --> Reported by: [dan2k3k4](https://www.drupal.org/user/2437398) >>> <p>Currently, all regions are returned when you go to authenticate, but if there is already a detected key in the backend for the hostname then it will always return that key, making the region selection pointless.</p> <p>Instead, we can display a message that a key was detected for the hostname and that we only let you select that single region for that key.</p>
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