CompatUI UX Improvements

This CL does the following UX improvements:
  - Increase fading animation duration to 400ms
  - Implement a logic for horizontal and
    vertical education indipendently which displays
    icons when in center position only once and
    every time user double-taps for a not-central
    position.
  - Remove the circles animation

Bug: 275054578
Test: atest WMShellUnitTests:ReachabilityEduLayoutTest
      atest WMShellUnitTests:LetterboxEduWindowManagerTest
      atest WMShellUnitTests:ReachabilityEduWindowManagerTest

Change-Id: I55cd13c83f43a8a31725e6f6493504bc3ab4e62e