Fix bubble transitions running too early

LaunchOrConvertToBubble and ConvertToBubble transitions now wait
with starting the expanded view animation and finishing the transition
until the surface is ready. Otherwise the transition may finish and
later once the task view surface is created it will trigger a restart
of the activity and will incorrectly update Home visibility which
results in flicker and incorrect bubbles state.

Bug: 407475117
Flag: com.android.wm.shell.enable_create_any_bubble
Test: manual
       - create app bubbles and verify they work as expected
Change-Id: I88f728194308cd2943ffdd2f634daa4ffd58fd50