Update A2dpService.connect() to check correctly for A2DP Sink UUID

Previously, the A2DP Sink UUID check was applied only if the
remote device contained A2DP Source UUID as well.

Also:
 - Use AdapterService to obtain the UUIDs of a device.
   This makes it easier to write UUID-related unit tests.
 - Added a new unit test.

Bug: 73207565
Test: Manual. New unit test added:
runtest bluetooth --test-class com.android.bluetooth.a2dp.A2dpServiceTest \
                  --test-method testOutgoingConnectMissingAudioSinkUuid
Change-Id: I651a6b176956042681834cba0ff74819bee3e73e