MIAMI — When Maria Corina Vegas took the stand in Downtown Doral Park, she moved her hands up and down the Venezuelan flag in front of her. “Where would this city be if not for the blood, sweat and tears of the Venezuelan immigrants immigrants?” she said. Miami-based immigration activists gathered at the park Thursday to denounce Florida Gov. Ron DeSantis’ administration flying two planes full of asylum-seekers, including 50 Venezuelans, to Martha’s Vineyard. The Republican governor’s decision comes a week after he promised the Cuban and Venezuelan communities in Miami that he would not send r…