A 17-year-old was arrested by Transit Police yesterday after allegedly stabbing a 19-year-old at the MBTA’s Green Street station in Jamaica Plain.Transit cops responded to the stabbing on the Orange Line platform about 2:30 p.m., Transit Police Superintendent Richard Sullivan said.The suspect’s name was not released because of their age.The victim, whose name was not released last night, was rushed to the hospital with a serious but non-life-threatening stab wound, Sullivan said.