AudioService: refactor BT profile management

Remove intent BluetoothAdapter.ACTION_STATE_CHANGED listener in AudioService
and only manage BT profiles disconnection via the profile service listener in BtHelper.
This removes possible race conditions between a disconnection received
via the intent and a connection via the service listener.
Also align BT Headset profile management on A2DP and LE Audio profile
management in AudioDeviceBroker, AudioDeviceInventory and BtHelper.
Process all profile related actions in AudioDeviceBroker message handler
for proper serialization.

Bug: 289681953
Test: make
Change-Id: I7106b7516706c542be1fbdad65067b3b09de6a61