SHANGHAI (Reuters) -China suspended dozens of international flights on Friday amid a global surge in Omicron cases, while the city of Shanghai curbed tourist activity as it rushed to head off local COVID-19 infections as imported cases rose. Cities across China are becoming more vigilant against COVID-19 ahead of the Lunar New Year travel season later this month and as Beijing readies to stage the Winter Olympics beginning Feb. 4, with many local governments urging residents not to leave town unnecessarily. Shanghai’s tourism and culture authority said travel agencies and online tourism compan…