Have BubbleTaskStackListener ignore tasks entering split

If an activity is restarted, but it is moving from bubble to split, it
is continuing to use MULTI_WINDOW windowing mode.
Previously we were attempting to expand the bubble for this task.
Check if there is a parent task and if that parent task is one of the
split root tasks. If it is, skip opening the bubble for the task.

Bug: 396315875
Test: atest WMShellRobolectricTests:BubbleStackListenerTest
Test: atest WMShellMultivalentTestsOnDevice:BubbleTaskStackListenerTest
Flag: com.android.wm.shell.enable_create_any_bubble
Change-Id: I2dd135d4397cae0101fc0405a82d177ee34a14f1