Note from @ebrinkman on 2019-06-20: We should adjust this to only be at the group level unless the community contribution is nearly complete with both group and project level toggles. ----- Allows `Owner` only [user permission level](https://docs.gitlab.com/ee/user/permissions.html) of groups to disable email notifications on a per-group, regardless of the users settings. #### Design * Need 'Owner' permissions to update this on group level * All areas where a user can update notifications should be `disabled` with a tooltip that says "Notifications have been disabled in group settings" * Preference should be added to settings - group > General Settings > Permissions, LFS, 2FA