Some of the biggest drug traffickers from New York — some of them linked to the Mafia — are flocking to Beverly Hills to meet suppliers, transact illicit deals and spend their dirty dollars amid the palm-lined streets and shimmering pools of the wealthy mecca, according to law-enforcement sources. “They seem to like the glamour of that life — the hobnobbing with celebrities and high-profile people,” one official told The Post, speaking on condition of anonymity.