Connection Assist on Android Polish

!1426 (merged) implemented connection assist (#41188 (closed)) in time for the next alpha, but there's some cleanups and fast follows I will collect here we can follow up on before and as testing feedback comes in:

• Domain Fronting issues: !1426 (comment 3175104)

• make use of TorConnect.getFrequentRegions as well (!1426 (comment 3175363))

!1426 (comment 3175327)

• You might want to rename this to regionNamesGet and use TorConnect.regionNames if !1438 (merged) lands before this.
• Also, in relation to !1438 (merged), you might want to re-fetch the regionNames either:

1. whenever the app locale changes, or
2. whenever you re-populate the region list in connect assist.

• cleanup use of _torConnectScreen.value: !1426 (comment 3176147)