An all-star defense team — including a former federal judge and an attorney who defended Boston Marathon bomber Dzhokhar Tsarnaev — are representing Michelle Carter in her pitch to have the state’s highest court throw out her unprecedented involuntary manslaughter conviction.Carter was given a 2 1⁄2-year jail sentence, with only 15 months to serve, last summer after Judge Lawrence Moniz found that she was responsible for Conrad Roy III’s suicide in July 2014.