Lois Weiss Commercial By Lois Weiss Published April 21, 2024, 6:47 p.m. ET Stefano Giovannini and Matthew McDermott Across the city’s boroughs, grocery stores are seeing green. The craters left by now-defunct big-box retail outlets, casualties of the pandemic, are proving to be fruitful opportunities for well-positioned purveyors of perishables. “COVID helped to create dynamics…