Get Rid of Contact Photos in iPhone's Mail App

When Apple released iOS 18.2, it introduced a major change to the Mail app with its new Categories and priority messages features. Categories automatically sorts your emails into four distinct sections: Primary, Transactions, Updates, and Promotions. The change also adds contact photos and business logos for conversations in your inbox, but if you don't like how they look, it's easy enough to make them go away.
Contact photos have been added to the Mail app in an effort to make it easier to iden