Hong Kong CNN  —  A surging Covid outbreak in China. Countries imposing travel restrictions on Chinese travelers, wary of the virus being imported. Scientists warning against fearmongering and xenophobia. But this isn’t early 2020. The familiar scene is playing out now as China battles its biggest-ever outbreak, after abandoning its stringent zero-Covid approach and partially reopening its border three years into the pandemic. The country announced this week it will drop quarantine requirements for international arrivals and resume outbound travel for Chinese citizens, which had previously been banned. It prompted a surge of eager travelers booking flights out of the country, hungry for a trip after several years of isolation…