Mayor Bill de Blasio sprang a COVID-19 vaccine mandate on all private businesses in New York City on Monday — drawing immediate rebuke from trade groups, New York office workers and some fellow elected officials who said the backbone of the Big Apple was “blindsided” by the stunning move. De Blasio, whose mayoralty ends at the stroke of midnight on New Year’s Eve, labeled making vaccines compulsory for private businesses a “pre-emptive strike” against an expected surge in COVID infections this winter amid the emergence of the Omicron variant. ... Kathryn Wylde, head of the business group Partnership for NYC,...