MS NOW’s Jen Psaki said on “The Briefing” that signs the “MAGA fever” is breaking are piling up after the midterms.As proof, she pointed to Tesla’s Cybertruck, House Speaker Mike Johnson (R-LA), and several conservative media figures.Psaki said Tesla is ending the Cybertruck, which she described as a rolling MAGA symbol. She floated several possible reasons: tech tycoon Elon Musk trimming costs after spending $500 million backing Republicans lik…