The need for social distancing led everyone from dairy farmers to restaurants and grocery stores to seek technological help. That will improve productivity, but will cost some lower-skilled jobs. When Kroger customers in Cincinnati shop online these days, their groceries may be picked out not by a worker in their local supermarket but by a robot in a nearby warehouse.Gamers at Dave & Buster’s in Dallas who want pretzel dogs can order and pay from their phones — no need to flag down a waiter. And…