If the coronavirus pandemic was supposed to send people fleeing high-priced dense cities in favor of more affordable options where people can work remotely, the Worcester area has not been a major beneficiary. A new analysis by the real estate firm CBRE Group shows fewer people moved out of the Worcester metropolitan area in 2020 than did in 2019, at least from those moving to or from elsewhere in Massachusetts. But fewer also moved in, leaving the area with what appears to be only a slight advantage. Nearly all those departing residents stayed close by, CBRE found in its national look at where people moved during the health crisis. Many of the largest and most expensive urban areas saw residents flee, including Boston, New York, San Francisco and Seattle.