Add alert to modmail notifications if user is in automod config

[Kirzi]

(This was discussed a few days ago, and we agreed to wait and see if it's needed before trying it, but I figured I'd leave the idea here so we don't forget.)

This hasn't happened yet due to the fact that updated modmail notifications are still relatively new. But I worry that even with those, we might overlook new activity by a user we were previously watching, since that relies on us recognizing the usernames mentioned by memory.

So I figured it might be helpful to add a new line to these notifications that informs us if a user is mentioned anywhere in the Automod config.

This would only happen if we were already getting a modmail notification about the user for another reason. It would just be another line that simply points out that it matches, so we know to look into it.

I guess there are other potential solutions to this, such as a button to add users to an internal FHQ list, but I figured that would be overkill.

[robdy]

I have it almost ready, only need to test if it catches all the rules.