le_audio: Update client test cases for monitor modes

This CL updates unicast handover mode test cases with respect of
recording audio mode.

Bug: 349310336
Bug: 381054654
Test: atest bluetooth_le_audio_client_test
Flag: com::android::bluetooth::flags::leaudio_use_audio_recording_listener
Change-Id: If498f209185ae39daabc7412d70404655a8e3890