By Bernard Orr BEIJING (Reuters) -Millions of urban workers were on the move across China on Wednesday ahead of the expected Friday peak of its Lunar New Year mass migration, as China’s leaders looked to get its COVID-battered economy moving. Unfettered when officials last month ended three years of some of the world’s tightest COVID-19 restrictions, workers streamed into railway stations and airports to head to smaller towns and rural homes, sparking fears of a broadening virus outbreak. Economists are scrutinising the holiday season, known as the Spring Festival, for glimmers of rebounding c…