He went from penthouse parties to a prison cell following his arrest on federal sex crime charges.Now RadarOnline.com can reveal Sean ‘Diddy’ Combs’ alleged jail conditions as he languishes behind bars in pretrial detention at Metropolitan Detention Center, Brooklyn.Prison insiders alleged the disgraced music mogul has been forced to sleep on a concrete floor in the facility’s Special Housing Unit as rats scurry around him.Sources also claimed Diddy has refused to eat over fears his food has been tampered with, and other inmates at MDC Brooklyn allegedly taunt the rapper with lyrics from his songs.Diddy’s jail conditions are said to…