ROME (Reuters) – Generali’s second-largest investor Francesco Gaetano Caltagirone said on Thursday he would present his own candidate to lead the insurer, challenging the reappointment of current CEO Philippe Donnet. Caltagirone, a construction magnate, said in a statement he would present a slate of candidates for the new board of Generali, ahead of an April shareholder meeting, which would include candidates for the positions of both CEO and chairman. Caltagirone, which held about 8% in Generali according to the most recent available data, and Luxottica founder Leonardo Del Vecchio, third la…