[openstreetmap/openstreetmap-website] Mentioning a user in a comment should send them a notification (Issue #6636)

[Minh Nguyễn]

1ec5 created an issue (openstreetmap/openstreetmap-website#6636)

Mentioning a user with `@UserName` in a changeset comment should send them a notification over e-mail. This makes it easier to rope someone into a changeset discussion that affects them. As @andrewharvey put it in https://github.com/openstreetmap/openstreetmap-website/issues/1111#issuecomment-740613023:

> I'd like to do this when commenting on a suspicious changeset by user A, who changed something user B originally contributed. By doing @ B I can loop them in to make them aware of the change and ask for any further details.

Users have long informally used `@UserName` to refer to another user by their display name here. Most users understood that the user would only receive a notification if they were already subscribed to the discussion. Users generally did not expect this syntax to notify the mentioned user. I think this is because we didn’t do anything in response to the syntax. It could just as well have been `$UserName` or `%UserName` for all we cared.

As of #6518 and #6597, we automatically link this syntax to the user profile. #6635 would encourage this syntax by autocompleting user names. This may cause some users to think there’s actually something meaningful behind the syntax. If we don’t send out a notification, there could be a misunderstanding between the users.

#1387 would supplement e-mail notifications with in-site notifications. Mentions should hook into that functionality too.

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