Add new filter to list private space apps when not in quite mode

This change handles listing of private space apps in Settings > Sound &
vibration > Do Not Disturb > Apps page.

Based on the new filter this page
- lists the apps from private space whenever profile is unlocked.
- when quite mode enabled privat space apps in the list is hidden.

Recording Link: b/322316632#comment3

Bug: 322316632
Test: Manual
Change-Id: Ie8a7b3376351c031a1abb8488eceb7859a1930fd

tests/robotests/src/com/android/settings/notification/zen/ZenModeAddBypassingAppsPreferenceControllerTest.java

@@ -162,4 +162,7 @@ public class ZenModeAddBypassingAppsPreferenceControllerTest {
         assertThat(pref.getKey()).isEqualTo(
                 ZenModeAddBypassingAppsPreferenceController.KEY_NO_APPS);
     }
+
+    // TODO(b/331624810): Add tests to verify updateAppList() when the filter is
+    //  ApplicationsState.FILTER_ENABLED_NOT_QUIET
 }