Defying two years of protests and lawsuits by union retirees, New York City’s Municipal Labor Committee voted Thursday to scrap some of the best retiree health care coverage in the country. The change aims to put 250,000 city retirees into a for-profit Medicare Advantage plan run by Aetna. Twenty-six unions in the MLC voted no, while others abstained. But their votes were swamped by the votes of…