Track non-telecom calls in telecom metrics.

Track non-telecom call in the telecom metrics; this helps to get an idea
of adoption of the Telecom APIs.  We track both non-telecom calls which
have no phone account and those with a phone account to get an idea of
where apps are avoiding using Telecom despite having integration.

Flag: com.android.server.telecom.flags.enable_call_audio_watchdog
Test: Added unit tests.
Test: Performed manual testing.
Bug: 384570270
Change-Id: I611691819d75b50d0a6f98cd02b8fc4434cad4ad