Antitrust regulators are set to prevent Hess Corp. (NYSE:HES) CEO John Hess from joining the board of Chevron Corp. (NYSE:CVX) as part of a $53-billion merger deal. What Happened: Chevron has tentatively agreed to this condition to secure approval for the merger, The Wall Street Journal reported on Friday, citing sources familiar with the matter. The deal still faces an arbitration case involving Exxon Mobil Corp. (NYSE:XOM) and China National Offshore Oil Corporation over rights to a key oil project in Guyana. The decision is a setback for John Hess, who was anticipated to join Chevron’s boar…