The board of the world’s most valuable carmaker has approved the award of shares to chief executive Elon Musk worth a staggering $29bn (£21.7bn) in efforts to prevent the billionaire from leaving the firm. The new award by Tesla, which amounts to 96 million new shares, comes as part of a new pay deal, after Musk threatened to leave the electric vehicle maker if he was not given more stock. It should also boost Musk’s voting power on Tesla’s board. Tesla’s board wrote on X, which is owned by Musk that “It is imperative…