HONG KONG—Hong Kong International Airport said it will ban transit passengers from 150 countries and territories starting Sunday, tightening stringent travel controls. Authorities also said Friday they will extend social distancing restrictions, including a ban on dining in after 6 p.m., by another two weeks over the Lunar New Year holidays to Feb. 3. Large-scale events, such as Lunar New Year fairs held annually in Hong Kong, will be canceled. The transit ban and extension of distancing rules come as the city grapples with an Omicron outbreak of the coronavirus, with most of the cases traced to two crew members of Cathay Pacific who had broken isolation rules and dined at restaurants and bars in the city before testing positive. Over the past two weeks, authorities have locked down multiple residential buildings across the city and mass-tested thousands as they sought to stamp out Omicron infections. “We’re worried that there …