Add waiting screen before PS setup completion

At the end of PS setup just before showing the final sucess screen this
change adds a new screen with loading layout which enables profile quiet
mode.
After enabling quiet mode checks if user is stopped before removing the
loading layout screen. Until user is stopped loading screen will be
shown.

Bug: 329042236
Bug: 328393532
Test: Manual verify new delay screen is shown
Change-Id: Iac3fd2f0f5c75a64719fbce32ff4dbfb533322d5

src/com/android/settings/privatespace/SetupSuccessFragment.java

@@ -86,8 +86,6 @@ public class SetupSuccessFragment extends InstrumentedFragment {
             if (activity != null) {
                 mMetricsFeatureProvider.action(
                         getContext(), SettingsEnums.ACTION_PRIVATE_SPACE_SETUP_DONE);
-                //TODO(b/307729746): Add a test to verify PS is locked after setup completion.
-                PrivateSpaceMaintainer.getInstance(activity).lockPrivateSpace();
                 Intent allAppsIntent = new Intent(Intent.ACTION_ALL_APPS);
                 ResolveInfo resolveInfo =
                         activity.getPackageManager()