TOKYO—Global shares advanced Tuesday following a rally on Wall Street as investors shrugged off concerns about the highly transmissible omicron variant of the coronavirus. France’s CAC 40 edged up 0.2 percent in early trading to 7,155.68, while Germany’s DAX added 0.3 percent to 15,878.65. Britain’s FTSE 100 was little changed at 7,372.10. U.S. shares were set for gains, with Dow futures up nearly 0.1 percent to 26,200.00. S&P 500 futures were little changed, up less than 0.1 percent at 4,783.25. With New Year celebrations approaching, the desire to let loose and party is being countered by uncertainties over omicron. In Britain omicron infections have pushed caseloads to record highs, and in other parts of the United Kingdom, authorities have ordered nightclubs to close and imposed limits on gatherings. Closures of nonessential businesses and lockdowns have taken effect or will soon in some European countries Much of Asia has yet to …