Add page for choosing calendar & reply for event modes.

Also adds the link to set trigger behavior to the main mode page (only for calendar so far), and the switch preference to enable/disable automatic rules (for all but manual DND mode).

Removes the "escape hatch" to allow manual mode to also use the new modes pages.

Ported from ZenModeEventRuleSettings.

Flag: android.app.modes_ui
Bug: 332730302
Test: ZenModeSetCalendarPreferenceControllerTest, ZenModeSetTriggerLinkPreferenceControllerTest, manual
Change-Id: Ia7a716c66663a21494a6c05711250a5bda87ca8c

src/com/android/settings/notification/modes/ZenModeFragment.java

@@ -46,6 +46,8 @@ public class ZenModeFragment extends ZenModeFragmentBase {
                 context, "zen_other_settings", mBackend));
         prefControllers.add(new ZenModeDisplayLinkPreferenceController(
                 context, "mode_display_settings", mBackend));
+        prefControllers.add(new ZenModeSetTriggerLinkPreferenceController(context,
+                "zen_automatic_trigger_category", mBackend));
         return prefControllers;
     }