At A time when the deadly coronavirus pandemic rages in much of the world and the global number of confirmed cases hurtles towards the 30-million mark, China’s celebration on Tuesday of its success against the virus first identified in Wuhan in December was much more than taking a victory lap.China’s hard-won fight has further bolstered the authority of President Xi Jinping, who used the occasion to extol merits of the one-party rule after the Chinese leadership’s credibility took a beating at…