Implement today and older for NUI Voicemail and update MediaPlayerView tests

This CL also updates the tests that were TODOs from http://b/70401224 to allow testing the MediaPlayerView

SCREENSHOT:
Today: http://screen/8KvVtLtHeq4
Older: http://screen/5oskBZPbDR5
Test: Unit tests
PiperOrigin-RevId: 178699528
Change-Id: Idab797eff18fd277618938a8a54da350c60b3d54
7 files changed