Use AccessibilityManager to get disappearing delay for compat ui

Use AccessibilityManager to get disappearing interval for
user aspect ratio button and reachability education.

Fix: 296065281
Test: Run atest WMShellUnitTests:ReachabilityEduWindowManagerTest
          atest WMShellUnitTests:UserAspectRatioSettingsWindowManagerTest
          atest WMShellUnitTests:CompatUIControllerTest

Change-Id: I631a02399efbd0123625254d7e774fe956d0b7a8