Long before it was cool for attractive young people to say opera is a “dying art form,” Jersey City’s Zombie Opera has been ironically winking at the notion that this 400-year-old tradition is long dead—and loving it. Zombie Opera was founded in 2020 during the pandemic; but the company it grew into, Undead Arts, has expanded their scope, and this weekend marked their first main stage collaboration with the New Jersey Symphony, presenting two pe…