chore: Disable email notifications for unconfirmed users (#10964)

- disable email notifications if the user hasn't confirmed the email yet, as there is potential chance for the emails to bounce

app/services/notification/email_notification_service.rb

@@ -4,6 +4,8 @@ class Notification::EmailNotificationService
   def perform
     # don't send emails if user read the push notification already
     return if notification.read_at.present?
+    # don't send emails if user is not confirmed
+    return if notification.user.confirmed_at.nil?
     return unless user_subscribed_to_notification?
 
     # TODO : Clean up whatever happening over here