Dozens of Chinese nationals gathered outside their embassy in Singapore on Tuesday in frustration over new rules requiring them to get tested for Covid-19 before they can board their upcoming flights home, something Singapore does not generally offer to those without symptoms.“No hospital in Singapore will perform a test for me,” said a 28-year-old warehouse manager who gave his surname as Wang. He is scheduled to fly to the western city of Chongqing at the end of the month. “Booking a flight…