feat: Clear all previous notifications if a new notification is added to a conversation (#8490)

app/jobs/notification/remove_duplicate_notification_job.rb

@@ -0,0 +1,16 @@
+class Notification::RemoveDuplicateNotificationJob < ApplicationJob
+  queue_as :default
+
+  def perform(notification)
+    return unless notification.is_a?(Notification)
+
+    user_id = notification.user_id
+    primary_actor_id = notification.primary_actor_id
+
+    # Find older notifications with the same user and primary_actor_id, excluding the new one
+    duplicate_notifications = Notification.where(user_id: user_id, primary_actor_id: primary_actor_id)
+                                          .where.not(id: notification.id)
+
+    duplicate_notifications.each(&:destroy)
+  end
+end