NEW YORK — A man and woman who watched Jam Master Jay’s final moments are expected to break their silence and describe how he was murdered before their eyes at the Brooklyn trial of the hip-hop icon’s alleged killers. Assistant U.S. Attorney Miranda Gonzalez said Monday that the Run-DMC founder’s manager, Lydia High, and his close friend, Uriel “Tony” Rincon, will both take the stand during the four-week Brooklyn Federal Court trial. Rincon, who was shot in the leg inches away from the slain DJ in his Queens studio in 2002, told the New York Daily News in a 2007 interview that he never saw the…