WASHINGTON— A controversial proposal that would have given consumers a $4,500 discount on domestic, union-made electric vehicles is officially off the table, Sen. Debbie Stabenow, D-Michigan, confirmed Wednesday to The Detroit News. Sen. Joe Manchin, a centrist Democrat from West Virginia who wields vast influence over his party’s legislative priorities, has been publicly skeptical of the added tax credit for months. On Tuesday, he told Bloomberg that the union provision is “gone” from the pared-down climate package he is negotiating with Senate Majority Leader Chuck Schumer, D-New York, and o…