By Nelson Bocanegra and Anggy Polanco CUCUTA, Colombia/SAN ANTONIO, Venezuela (Reuters) – Colombia’s leftist president-elect, Gustavo Petro, pledged on the campaign trail to end neighboring Venezuela’s isolation, normalize relations with the socialist government in Caracas, and get trade flowing. For locals on both side of the border, that can’t come fast enough. “It’s extremely important and perhaps vital for our company to have that border open,” Carolina Moros, co-owner of a biodegradable detergent company in Colombia’s border city of Cucuta, told Reuters. Her company, which she co-owns wit…