[Audiosharing] Add dialog for share then pair with classic headset

In share then pair flow, after users are routed to pair new device page,
if they pair a classic headset, we will show this dialog to explain that
the headset does not support audio sharing.

Test: atest
Flag: com.android.settingslib.flags.enable_le_audio_sharing
Bug: 362858921
Change-Id: I9cb600fa890563c179ac265c3f9c8cda52e4d296