By Stella Qiu (Reuters) -Australia celebrated its first restriction-free New Year’s Eve after two years of COVID disruptions, as the world began bidding farewell to a year marked for many by the war in Ukraine, economic stresses and the effects of global warming. Sydney, one of the world’s first major cities to welcome in the New Year, did so with a typically dazzling fireworks display, which for the first time featured a rainbow waterfall off the famous Harbour Bridge. “This New Year’s Eve we are saying Sydney is back as we kick off festivities around the world and bring in the New Year with …