By Farah Master HONG KONG (Reuters) – Hong Kong is following mainland China’s zero-tolerance approach to control COVID-19, rankling many residents of the international financial hub as much of the world shifts towards living with the coronavirus. Hong Kong effectively closed its borders and imposed social restrictions this month to deal with a spurt in COVID-19 infections due to the spread of the Omicron variant. Although the moves are less strict than those in parts of the mainland, they come after months of relative normalcy and are battering a city dependent on business travellers and accus…