There may be no greater moment on Euphoria — or on TV in general, quite frankly — than Lexi’s play. After two seasons of unbridled chaos on the HBO series, Maude Apatow’s Lexi held a mirror up to her classmates and family by writing a play about their lives in the last two episodes of Season 2, staging their antics in perhaps the most expensive high school production ever made. (Seriously, where did she get the budget for a carousel and tons of …