WASHINGTON — The Supreme Court on Thursday added five new cases to its calendar for the term that begins next week, among them a challenge to federal election law brought by Republican Sen. Ted Cruz of Texas.Cruz’s challenge involves rules about repaying a candidate for federal office who loans his or her campaign money. Under the law, a campaign can repay the candidate up to $250,000 with money collected after the election.Cruz argues that the current rules deter candidates from loaning money to their …