[Audiosharing] Avoid dialog flickering for same bt device group.

Before this change, the dialog will dismiss and show up again if the
second bud of the same group is connected.

In this change, StopDialog and JoinDialog will only update the message
and event listener when the dialog is triggered by another device with the same group id or the new bt device with different group id. (No dismiss and show); DisconnectDialog will only dismiss and show again when a new bt device with different group id is connected and update the event listener when another device with the same group id connected.

Also dismiss the dialog when the triggering device disconnect or join
the sharing.

Test: atest
Bug: 305620450
Change-Id: I798812101cefb24185d76d56f78eae27712dd7a6