By Sheila Dang (Reuters) -Just a week before the opening ceremony of the 2022 Olympic Winter Games, U.S. television viewers can be forgiven for forgetting the date, or even that it is taking place in Beijing, China. Unlike any Games in recent memory, the nearly 20 official international and national Olympic sponsors have laid low, ducking the press and viewers by holding back on the advertising blitz that typically kicks off months ahead the “let the Games begin” pronouncement. By Wednesday, only two spots had launched, both of which focus on athletes with no mention of the host country, with …