Mamdani insider Sam Levine oversees all workers and consumers in New York City. Corrie Aune for BI Sam Levine can't stand a ripoff. He's New York City's millennial commissioner of Consumer and Worker Protection. The former lawyer — who worked under Lina Khan at the Federal Trade Commission — said he didn't hesitate to file a complaint with the department this spring when CVS sent him an expired coupon. And he thinks it's ludicrous that his halal guy charged him more than $20 for his…