An Upper West Side condo is seeking to force a former “Saturday Night Live” band member from the building — and, no, not for playing jazz too loud. An explosive new lawsuit details a frightening late-night outburst in May by the veteran musician — one allegedly so severe that board members are seeking to force him out, The Post has learned.  Lawrence Feldman, 75, an accomplished alto saxophonist, has owned apartment 3C at the Admaston condominium on West 89th Street since 1986, when records