HONG KONG—Hong Kong authorities announced a two-week ban on flights from the United States and seven other countries and held 2,500 passengers on a cruise ship for coronavirus testing Wednesday as the city attempted to stem an emerging omicron outbreak. The two-week ban on passenger flights from Australia, Canada, France, India, Pakistan, the Philippines, Britain, and the United States will take effect Sunday and continue until Jan. 21. Hong Kong leader Carrie Lam also announced that restaurant dining will be forbidden after 6 p.m. for two weeks starting Friday. Game arcades, bars, and beauty salons must also close during that period. “We have to contain the pandemic to ensure that there will not be a major outbreak in the community again,” Lam said at a news conference, adding that the city is “on the verge” of another surge. The measures came as new omicron clusters have emerged over the past …