TEST: Fix Broken Java unit tests

* HeadsetClientServiceTest should not try to start HeadsetClientService
  when PBAP client is not supported on the current build target because
  HeadsetClientService will not be included in Bluetooth.apk in such
  platform
* The fix skips starting service when R.bool.profile_supported_hfpclient
  if False
* PbapParserTest should cleanup device's call history before doing
  observation test on it

Bug: 68015458
Test: runtest -j40 bluetooth
Change-Id: I5c6d0049bd052fd736400e6022c1e83764424571