Stop isolates when invalidating the forker, instead of killing'em
Stop isolates when invalidating the forker, instead of killing'em

This lets isolates send the "lastbeat" message for Herald HTTP discovery.

isandlaTech/cohorte-runtime,isandlaTech/cohorte-runtime,ahmadshahwan/cohorte-runtime,isandlaTech/cohorte-runtime,ahmadshahwan/cohorte-runtime,ahmadshahwan/cohorte-runtime,isandlaTech/cohorte-runtime,ahmadshahwan/cohorte-runtime,isandlaTech/cohorte-runtime,ahmadshahwan/cohorte-runtime,isandlaTech/cohorte-runtime,ahmadshahwan/cohorte-runtime