Refactor getAllUsers, getAllAdminUsers, and getAllUsersExceptGuests

 - Move these three methods to Settings app where they're being used
 - Refactored UserHelper a little to support "all users"
 - Updated tests

Bug: 137136907
Test: atest CarSettingsRoboTests
Test: atest CarUserManagerHelperTest

Change-Id: I48d9aab0ced3d5dd2b7fbfbe3ca7c872bf5b644d
15 files changed
tree: 66e1659851604f8cc8d7af45e2b5e49768931cb7
  1. res/
  2. src/
  3. tests/
  4. Android.bp
  5. AndroidManifest.xml
  6. PREUPLOAD.cfg