By Gertrude Chavez-Dreyfuss NEW YORK (Reuters) – The U.S. dollar scaled two-year peaks, as a wave of risk aversion hit global markets, while the Chinese yuan posted its largest three-day losing streak in nearly four years on growing worries of an economic slowdown in the world’s second-largest economy. With war in Ukraine entering a third month and growing concerns of a China-wide COVID-19 outbreak sparking a rout in Chinese stocks, investors dumped currency market darlings like the Australian dollar and the offshore Chinese yuan. Against a basket of its rivals, the dollar rose to 101.86, a le…