By Gabriel Crossley and Martin Quin Pollard BEIJING (Reuters) – China’s meticulous plans to prevent an Olympics-seeded COVID-19 outbreak by sealing all participants inside a “closed loop” for the upcoming Winter Games will be tested by the emergence of the highly infectious Omicron variant. The country has reported only a handful of Omicron cases and has largely succeeded in containing COVID-19 since it first emerged in the central city of Wuhan two years ago, thanks to a zero-tolerance policy that includes rigorous contact tracing, strict targeted lockdowns, and travel curbs that have drastic…