DETROIT — The maker of Jeep SUVs and Ram pickup trucks has joined the flock of companies pausing paid advertising on Twitter after Tesla Inc. CEO Elon Musk bought the social media platform. Stellantis NV on Monday confirmed it had pulled paid advertisements after last week, saying it would exercise “vigilance” under the new leadership through its ad agencies. “We’re pausing paid advertising posts,” spokeswoman Diane Morgan said in a statement, “until we have a clearer understanding of the future of the platform under its new leadership.” The company didn’t elaborate on what clearer understandi…