fix: [event] `merge from` feature correctly saves object relations. Fix #6969
fix: [event] `merge from` feature correctly saves object relations. Fix #6969

SteveClement/MISP,MISP/MISP,SteveClement/MISP,MISP/MISP,SteveClement/MISP,MISP/MISP,SteveClement/MISP,SteveClement/MISP,MISP/MISP,MISP/MISP