NEW YORK — Dozens of Latin American migrants — including children and a pregnant woman — spent five days on buses in order to get to New York City from Texas after Winter Storm Elliott upended their itinerary, volunteers who greeted the wary travelers told the Daily News. The roughly 50 migrants arrived at the Port Authority Bus Terminal in Manhattan on Christmas Day after leaving by bus from the Texas border city of El Paso on Dec. 20, said Power Malu, the founder of a group called Artists, Athletes, Activists. “It was the longest ride that anyone has experienced since the buses started arriv…