Add highlight menu keys for all toggle pref controllers and custom slices

Bug: 204695404
Test: manual, robotest build pass, unit
Change-Id: Iad2e28ada8ddb766ffa7eff2c8dc581250cbd6f8

src/com/android/settings/biometrics/combination/BiometricSettingsAppPreferenceController.java

@@ -91,4 +91,10 @@ public class BiometricSettingsAppPreferenceController extends TogglePreferenceCo
     public final boolean isSliceable() {
         return false;
     }
+
+    @Override
+    public int getSliceHighlightMenuRes() {
+        // not needed since it's not sliceable
+        return 0;
+    }
 }