Remove leaudio_broadcast_extract_periodic_scanner_from_state_machine flag

Remove dead code caused by flag, i.e. onSyncTransfer in BassClientService, not used variables and messages in BassClientStateMachine, all methods marked by throw exception under flag.

Bug: 333691526
Test: atest BassClientServiceTest BassClientStateMachineTest
Test: manual tests
Change-Id: Iae64daba3812f5175cdef8796c4c3ba616607c80