Fix flaky test for persistent notifications

Persistent notifications test sometimes fails due
to setup activity doesn't exit due to failed intent.
Adding setup exit command when on device tests are starting and
adding timeout for transition.

Test: m Settings && adb install -r $ANDROID_PRODUCT_OUT/system_ext/priv-app/Settings/Settings.apk
Flag: EXEMPT bugfix
Bug: 349820489
Change-Id: Iaf1c1f481612367bbce919b27e89f88a24abb582

src/com/android/settings/development/PageAgnosticNotificationService.java

@@ -134,6 +134,6 @@ public class PageAgnosticNotificationService extends Service {
 
         // No updates should be allowed in page-agnostic mode
         disableAutomaticUpdates();
-        return Service.START_NOT_STICKY;
+        return Service.START_REDELIVER_INTENT;
     }
 }