By Megan Feringa Manchester United are returning to Wembley Stadium for a second successive FA Cup final after ending Chelsea’s treble hopes. Sunday’s 2-1 loss marks the latest chapter in a haunting unravelling of a season for the reigning league champions. This was not the way it was meant to go. This was meant to be a season-long celebration of all things Emma Hayes, a history-making season hoovering up the final pieces of silverware on offer. But that’s the beauty of this game: The twists are as unpredictable as the most predictable turns. That much was certain as Lucia Garcia met Leah Galt…