[Metrics] Utilize API Prepared Bit to Emit

This ensures we collect the prepared api bit across track 1 and track 2,
and emits it using our metrics system. Currently just used for the Get
flow.

Bug: 393172214
Bug: 362995981
Test: Chained tests to follow up, and build/statsd via DevTestApp.
Change-Id: I9c83269080f1208188a58a82bd81ebedc2f65fdb
Flag: android.credentials.flags.fix_metric_duplication_emits