WASHINGTON—In a move to expedite oil and gas pipeline projects, President Trump plans to sign a pair of executive orders that would overhaul some environmental permitting rules and limit shareholder resolutions aimed at environmental concerns, according to a senior administration official. The orders, which Mr. Trump plans to sign Wednesday, are in part aimed at blunting the ability of environmental activists and state regulators to use the Clean Water Act to obstruct oil and gas pipeline projects, the official said. …