With its ensemble of doctors, nurses, interns and patients squeezed together into a small emergency department with scripts that play out in real time, “The Pitt” feels like a lab made to grow great performances. The Emmys rewarded it accordingly Wednesday. Thirteen of the 25 nominations for HBO Max’s drama about a Pittsburgh ER went to its actors in one of the great achievements for a cast in Emmy history. In its rookie season last year, “The Pitt” got just three acting nominations but it won a