When transcription setting is enabled, retranscribe voicemails

When transcription toggle is turned off, we delete all local transcriptions. However when it is turned back on, we should re-transcribe all those( previously transcribed, then deleted) voicemails again.

Bug: 74033229
Test: N/A
PiperOrigin-RevId: 190640972
Change-Id: Iaaf324e74c7630852daeb314f34c2c3095fe3196