Start new tasks under the same created-by-organizer task

If a task is launching from a created-by-organizer task, it
should be launched into the same created-by-organizer task.

Bug: 407669465
Test: start bubble from an existing bubble
Flag: com.android.window.flags.root_task_for_bubble
Change-Id: Icca8d03cdfb58da95484a959f2adfa6efbc977b2