LAS VEGAS — If California Gov. Gavin Newsom runs for president in 2028, next-door Nevada will be a crucial test. This fall’s governor’s race is offering a preview.As GOP Gov. Joe Lombardo runs for reelection, he’s trying to pin high Nevada fuel prices — a majority of which is imported from California — on “Gavin Newsom’s energy policies.” He lambasts California as too expensive and too regulated. And he’s hammering his Democratic opponent, Attor…