Remove unused interfaces and controllers

- Some interfaces only existed to propagate configuration or keyguard
  changes which now go through the ShellController.  TaskSurfaceHelper
  is no longer used since game dashboard has moved to GMS.

Bug: 238217847
Test: atest WMShellUnitTests
Change-Id: Ie8c5a77bf7bd5b8cc5f4a1b2382013228b1e5e3d