The Gray Man — out Friday on Netflix — brings the Russo Brothers, directors of Avengers: Endgame and Avengers: Infinity War, back into big-budget action filmmaking. And they have all the right ingredients at their disposal. For one, they are working with the writers behind those Avengers movies, Christopher Markus and Stephen McFeely, who have shown themselves capable of handling unwieldy material. By contrast, The Gray Man — based on…