This notification handles the updates when there is any activity happened in the posts which the user created.
Acceptance Criteria: The iOS app should handle notification and open the discussion response screen of a particular user-created post.
Update the wiki
This ticket would not be as separate PR, as the handling of push notification has already done under the scope of LEARNER-7465: iOS - Create a Push Notification handling framework. In this ticket, I verified the background push notification and its routing toward the discussion post of the enrolled course.