Prior to ROS v3.0.0-beta.3 there was no distinction between full and reference Realms. Now, after https://github.com/realm/realm-object-server-private/pull/936, there is.

The key points appear to be that a given Realm is created as either a full or reference Realm. Reference Realms are created the first time a user opens a partially-synced Realm with that URL. Full Realms cannot be used for partial sync, and reference Realms can only be opened directly by an admin user. Reference Realms must otherwise be accessed via partial sync.

There are a couple of different ways that Realm Studio may need to be updated to accommodate this:

• [x] Make it clear in the UI which Realms are full vs reference Realms.
• [x] Support opening reference Realms directly as an admin user.
• [ ] Support creating reference Realms directly.