Ignore read voicemails for notifications

Previously the notification is only auto-canceled if it is deleted from the server. In this CL it will also be canceled if it is read.
TEST=TAP
Bug: 80214330
Test: TAP
PiperOrigin-RevId: 200134453
Change-Id: I716c4c6ee060a7b4162147d9bf9e2e1f5077317a
2 files changed