leaudio: Remove CIG when all ASEs are in the Releasing state

We should remove CIG only when there is no active ASEs.
In this patch we also add a guard which block creating CIS when CIG is
not exist.

Bug: 282506986
Test: atest bluetooth_le_audio_test bluetooth_le_audio_client_test
Test: BluetoothInstrumentationTests
Tag: #feature

Change-Id: I4943ed9869945f6d63c4f77c8f9c199aaa345a08