By Dan Marsh Sir Dave Brailsford celebrated emphatically after Manchester United’s dramatic last-gasp victory over Liverpool on Sunday. The Red Devils and their arch-rivals played out an enthralling FA Cup tie at Old Trafford, but extra-time was required to determine who would advance to the semi-finals of the competition. The match was 2-2 at the end of normal time after a late goal from Antony. Harvey Elliott restored Liverpool’s lead in the 105th minute to leave Erik ten Hag’s side on the brink of elimination. However, two quickfire goals from Marcus Rashford and Amad Diallo, the latter in …