A music producer who filed a lawsuit against Sean “Diddy” Combs last month has now accused actor Cuba Gooding Jr. of sexually harassing and assaulting him, an amended federal complaint filed Monday night shows.The amended civil complaint was filed in U.S. District Court in Manhattan hours after federal officials searched Combs’ homes. Combs is a subject of a federal investigation, and several people have been interviewed by federal officials in Manhattan in relation to allegations involving sex trafficking, assault, illegal narcotics and firearms, a source familiar with the matter…