Inflate dismissal background instead of drawing while swiping

- Only swipe the foreground out to have the background revealed.
- Inflate dismissal_swipe_background.xml while swiping.
- Fix the fly-in transition.
- Fix the overlapping problem.

Bug: 129742618
Test: robotests
Change-Id: I5311e50332d0ea0437d1693d075d5c3a2176a443