Don’t break up because of that Mam! New York leaders are desperately trying to stop billionaire bigwigs from hightailing out of the Big Apple with their cash, businesses and thousands of jobs — as fears mount that Mayor Zohran Mamdani’s policies will accelerate the Empire State’s nation-leading loss of wealth. The splashy one-two punch of Citadel CEO Ken Griffin and Apollo Global Management honcho Marc Rowan pledging to expand outside New York City has been coupled with a silent wave of businesses “quiet quitting” the city over its hostile environment, insiders told The Post. New York leaders are desperately encouraging billionaires to stay put amid growing fears that Mayor Zohran Mamdani’s policies could have a ripple effect on the Empire State’s wealth. @NYCMayor /X The burgeoning biz-exit has prompted Andrew Murstein, founder of Medallion Financial Corp., to launch a campaign dubbed Operation Boomerang to woo his peeved peers back into the New York groove.…