Always notify Bubbles when unfold finished

Notify bubbles that the unfold transitions is finished
in the beginning of the finish callback because the
callback may return early leaving the transition stuck
in the task view transitions queue, blocking subsequent
transitions from playing.

Bug: 418131777
Flag: com.android.wm.shell.enable_bubble_bar
Test: manual
       - have expanded floating bubble
       - unfold
       - verify floating bubble transitions to bar

Change-Id: I168232e2be4ab65bdf9aaccf44202382d27163db