It’s a bird! It’s a plane! No — actually, it’s a 37-foot-tall inflatable Minion in the sky. The mischievous Minion Stuart from the blockbuster comedy, “Minions: The Rise of Gru,” was one of five new balloons that took to the skies for Macy’s Balloonfest at the Meadowlands Sports Complex in East Rutherford on Saturday, in preparation for the 96th Macy’s Thanksgiving Day Parade. At Macy’s Balloonfest, the parade’s new giant characters are test flown under the direction of Macy’s practiced flight management team. Joined by a few hundred volunteer balloon handlers, the team navigates an outdoor tr…