The biggest secret in Game of Thrones is out. In the Season 8 premiere, Jon Snow's best friend, Samwell Tarly, told the former King in the North who he really is – not a bastard, but Aegon Targaryen, sixth of his name and the true heir to the Iron Throne. But should that matter? To Samwell Tarly, the answer in Sunday night's episode was yes. Sam (who'd just learned that Dany had his father and brother killed for refusing to bend the knee) reminded Jon that he gave up his crown for his people, and then asked if …