[Live Tile] Support launching another task (other than the current running task) in Overview

- Get rid of the defer cancelation logic
- Render animation on the task view of the task being launched upon task view appeared callback
- Finish the recents animation upon the end of the recents window animation

Fixes: 164926736
Test: manual
Change-Id: Ibffb6a9c74c235efc8615a22b0306551532c7b61