While the rest of his teammates got the day off after a nine-game, three-city road trip, Jasson Domínguez spent Thursday getting a CT scan on his left elbow. As the Yankees awaited the results for a more definitive diagnosis after Domínguez was hit by a pitch in Wednesday’s loss to the Rangers and X-rays were “inconclusive,” they were forced to consider how they might fill the void if the young DH/outfielder has to miss time. In the short term, they could activate Anthony Volpe from the injured list Friday to take Domínguez’s roster spot (as opposed to Max Schuemann if Domínguez does not need the IL). But that would still leave an opening at designated hitter as long as Giancarlo Stanton remains on the injured list with a low-grade right calf strain. Jasson Domínguez reacts after getting hit by a pitch during the Yankees’ April 29 game.…