[Audiosharing] Route to audio sharing page to start broadcast.

Since we already support auto start sharing and add source from QS pill
click. We can reuse the intent when user click on the second LEA headset
to start audio sharing from Connected devices page.

Test: atest
Bug: 331892035
Flag: com.android.settingslib.flags.enable_le_audio_sharing
Change-Id: I83f7ae25ed96bbddb3c631b69b409f09577f421b