By Elizabeth Dilts Marshall NEW YORK (Reuters) -Global shares retreated from recent highs on Wednesday, as Asian markets grew jittery about a resurgence of COVID-19 cases and Western markets awaited Friday's U.S. jobs report and what it might mean for monetary policy. Asset markets have been buoyed over the past year by trillions of dollars in monetary and fiscal stimulus from global central banks responding to the pandemic. Successful vaccination rollouts have fueled economic recoveries in some places, with consumer confidence in June surging in Europe and the United States. But fears over a ...