[ENG-9857] Refactor notification type references to use NotificationTypeEnum#11520

Ostap-Zherebetskyi wants to merge 2 commits intoCenterForOpenScience:feature/notifications-refactor-post-releaseCenterForOpenScience/osf.io:feature/notifications-refactor-post-releasefrom

Ostap-Zherebetskyi:fix/consolidate_notification_type_enumOstap-Zherebetskyi/osf.io:fix/consolidate_notification_type_enumCopy head branch name to clipboard