This is similar to T147952 but for "Today's featured article" instead of "In the news".
We want to avoid repeating the same information in the explore feed. If a wiki choses to reuse TFA articles for multiple days (scowiki, huwiki, bswiki) we probably want to omit the duplicates.
We could probably add an optional start date field to the tfa, which a client could use to filter out later the TFA card display for later dates.