Polish taskbar un/stash animation.

- When QSB is inline, we add it to the reveal animation
  so that it moves in coordination with the rest of the
  taskbar icons
- Hide All Apps button when transitioning from Home -> App
  to match spec
- Shorten duration icons move in x duration so that they
  stay within the taskbar background bounds.

Bug: 267806083
Bug: 246635237
Bug: 246660243
Test: transient taskbar
      with isQsbInline = true and false

Change-Id: Ie6b866311cc2ceba88cdf01652b30fee457d0359
Merged-In: Ie6b866311cc2ceba88cdf01652b30fee457d0359