Play voicemails downloaded from the voicemail server in the NUI VM Fragment

Voicemails that are available locally on the device (have been downloaded from the voicemail server) will have their "HAS_CONTENT" column set to one. This CL adds the plumbing logic of checking that when a user presses the play button, if the voicemail is available locally, it is played.

Bug: 64882313,68382421
Test: Existing unit tests
PiperOrigin-RevId: 175590204
Change-Id: Id164d08c16b89c84a75af0c4a7c899c02d64fff7