[ENG-8830] PROVIDER_MODERATOR_ADDED email#11288

Johnetordoff merged 3 commits into

CenterForOpenScience:add-new-notifications-data-modelCenterForOpenScience/osf.io:add-new-notifications-data-modelfrom

Ostap-Zherebetskyi:fix/provider_moderator_emailOstap-Zherebetskyi/osf.io:fix/provider_moderator_emailCopy head branch name to clipboard