By Chris Kirkham LOS ANGELES (Reuters) -Tesla's board of directors has pushed in all its chips on Elon Musk. Now investors must decide whether to back the biggest bet in company history. Shareholders will vote Thursday on the stark choice presented by the board: pay Musk up to $878 billion in company stock or take the risk he will leave – potentially driving down the company’s stock. The decision, experts say, amounts to a referendum on whether traditional corporate-governance rules apply to the world's richest man. The board and many investors argue that only Musk can deliver on his promises to transform Tesla into an artificial-intelligence juggernaut delivering millions of self-driving robotaxis and humanoid robots. If Musk hits all the board’s performance goals within a decade, Tesla’s

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