Paul McCartney will take stage at Apple headquarters in Cupertino Tuesday night to celebrate the company’s 50th Anniversary, The Post has learned. The concert will take place at the tech giant’s massive headquarters, Apple Park, nicknamed “the spaceship” for its circular design. The campus is home to 12,000 employees, according to Apple. Staffers had to enter a lottery for the chance to attend the show. Over the weekend, the legendary Beatle took over Hollywood by playing intimate gigs Friday