Roll out email_on_added_notifications
What does this MR do and why?
Roll out email_on_added_notifications. See:
- [FF] `email_on_added_mentions` -- notify users ... (#591869 - closed) — the FF roll-out issue.
- Notifying user when mentioned in an edited comment (#118779 - closed) — the issue being addressed.
- Send notification emails when notes have newly ... (!224837 - merged) — the MR that introduced the FF.
This is already enabled site-wide for GitLab.com; this change means all instances will send email notifications when a note is edited to add a mention of a previously unmentioned user.
How to set up and validate locally
Testing the change itself is per !224837 (merged)'s validation instructions, except the FF enablement is no longer required.
MR acceptance checklist
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