Migrate intercept back pressed to WindowContainerTransaction

- This call only sets state for a particular container and having it
  in a WCT aligns with other container-states we are setting

Bug: 378565144
Flag: EXEMPT bugfix
Test: atest ResizeTasksSyncTest WindowOrganizerTests
Test: atest TaskViewTest TaskViewTransitionsTest BubbleUtilsTest
Test: atest BubbleTaskViewListenerTest BubbleTaskStackListenerTest
Change-Id: Idb4278f19ba8babad8e4412972b869c315795c01
Signed-off-by: Winson Chung <winsonc@google.com>