[ENG-9997] update legacy notification migration logic#11516

cslzchen merged 1 commit intoCenterForOpenScience:feature/notifications-refactorCenterForOpenScience/osf.io:feature/notifications-refactorfrom

Ostap-Zherebetskyi:fix/migrate_notificationsOstap-Zherebetskyi/osf.io:fix/migrate_notificationsCopy head branch name to clipboard