Paul McCartney, Billie Eilish, Finneas and Sheryl Crow have joined NBC’s upcoming “Ukraine: Answering the Call,” a special program that aims to raise awareness and funds for Ukraine. They join previously announced stars including José Andrés, Jon Batiste, Kristen Bell, Brandi Carlile, Brian Cox, Jeff Daniels, Vera Farmiga, Lena Headey, Alicia Keys, Simu Liu, Julianne…