By DEE-ANN DURBIN, AP Business Writer WILBRAHAM, Massachusetts (AP) — Friendly's Restaurants, the 85-year-old East Coast dining chain known for its Fribble milkshakes and ice cream sundaes, is filing for bankruptcy protection. It joins a growing list of well-established restaurant chains that are failing due to an unchecked pandemic in the United States. George Michel, CEO of FIC Restaurants Inc.,