le_audio: Handle removing streaming device from group

Removing device which participates in streaming is special case and
needs additional steps to be done before removing it from group.
LE Audio streaming group needs to be stopped and reconfigured then the
device can be removed from group.

Tag: #feature
Bug: 255245714
Test: atest bluetooth_le_audio_test bluetooth_le_audio_client_test
Change-Id: I4d59f4830959098ab20c882a8f1c706301ade24c