ALBANY, N.Y.—New York Gov. Andrew Cuomo’s top aide resigned Sunday after an investigation overseen by the state’s attorney general concluded he sexually harassed 11 women. Melissa DeRosa, who had been one of Cuomo’s most fierce defenders and strategists, said in a statement sent to multiple new organizations that serving the people of New York had been “the greatest honor of my life.” But she added, “Personally, the past two years have been emotionally and mentally trying.” She didn’t give a more specific reason for her resignation. “I am forever grateful for the opportunity to have worked with such talented and committed colleagues on behalf of our state,” she said. DeRosa’s departure comes as Cuomo has dug in for the fight of his political life despite the threat of criminal investigations and widespread calls for his impeachment. Scores of Democrats, including President Joe Biden, have urged him to leave office or …