Remove Overview atomic animation support

- Remove PLAY_ATOMIC_OVERVIEW_SCALE and PLAY_ATOMIC_OVERVIEW_PEEK
- Remove complicated parallel atomic animation support from
  AbstractStateChangeTouchController and subclasses
- Remove some code related to going between Overview <-> AllApps

Test: Swipe between states in all 3 navigation modes
Bug: 175137718
Change-Id: Ice314d46946c3a983cdc6ccf1a67effb5da9156e