Switch expandAndSelectBubble to be gated by create flag

These are needed for behavior around launching a new task
from a bubble. The UI entry points to transform something fullscreen
are gated by the fullscreen flag so it should be fine to use the
create flag here.

Flag: com.android.wm.shell.enable_create_any_bubble
Test: manual - create gmail bubble, tap compose, observe it opens
               as a separate bubble
Bug: 415724598
Change-Id: I034a27f706dfe3a9933448686ea62f34d29b9c55