By Lucia Mutikani WASHINGTON (Reuters) – U.S. private payrolls fell for the first time in a year in January as soaring COVID-19 infections disrupted business operations, raising the risk of a sharp decline in employment that would deal a temporary setback to the labor market. The surprise drop in payrolls in the ADP National Employment report on Wednesday was across all industries and business sizes. It added to a slowdown in manufacturing activity last month in suggesting that the economy lost significant momentum at the start of 2022 as coronavirus cases, driven by the Omicron variant, raged…