Merge changes from topic "cherrypicker-L89500000962957882:N78800001403169312" into aosp-main-future

* 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.