If there was ever a role designed to weaponise Brooke Lynn Hytes’ statuesque presence, impeccable posture and bone-dry delivery, it’s Amber, the gloriously condescending first-class attendant she plays in Stop! That! Train! Directed by Hairspray filmmaker Adam Shankman and produced by the team behind RuPaul’s Drag Race, the unabashedly camp disaster-movie spoof takes its cues…