update the WATCHDOG_DISCONNECTED_STUCK_VOIP_CALL_MSG message

WATCHDOG_DISCONNECTED_STUCK_VOIP_CALL_MSG was vague and could mislead users into thinking there is a problem with the VoIP call.  Rather, it is to report apps that are not integrating with telecom correctly.

Bug: 370159602 (update anom msg bug)
Bug: 360298368 (original bug)
Flag: com.android.server.telecom.flags.disconnect_self_managed_stuck_startup_calls
Test: presubmits
Change-Id: I601ec06186cf42489761a24f3abec8aefd68f92b