Merge changes I67dc51b5,I6546759a,I258629e1,I74cc61fd,I74b2b757, ... into udc-dev-plus-aosp

* changes:
  fix(non linear font scaling): fix test timeout flakiness
  Fix flaky tests
  Fixes @Nullable issues SystemUI-tests
  Fixes @Nullable issues in System UI and WMShell.
  Fix more kotlin nullable errors in services.permission
  Fix runtime kotlin nullable error in ScreenshotDetectionControllerTest
  Fix NullPointerException in ControlsRequestDialogTest
  Fix tests broken by @NonNull annotation fix
  Fixes more  @Nullable issues in System UI and WMShell.