[Wikimedia-search] Tasks outside of Phabricator aren't real

Hi all,

This is a gentle reminder that if your task doesn't exist as a Phabricator ticket, then the person/team who can get it done doesn't know there's an actual need for it.

It allows us to avoid situations like "Person A said they think Person B is working on Thing X" meanwhile B has no idea X was even a thing.

Thanks, Mikhail