By Martin Quin Pollard and Pawel Kopczynski BEIJING (Reuters) – In a hived-off section of the Beijing airport, arrivals for next month’s Winter Olympics are met by staff in white protective suits and undergo COVID-19 tests and swabs of luggage before being whisked in police-escorted buses to fenced-off hotels. Unlike last summer’s Tokyo Games, which took place in a porous “bubble”, the perimeters of Beijing’s “closed loop” are sealed and guarded – precautions that will be put to the test as the highly transmissible Omicron variant surges globally. At the entrance to the Main Media Center this …