Nov 22 (Reuters) - A federal judge on Friday rejected the U.S. Securities and Exchange Commission's request to sanction Elon Musk after he failed to appear for court-ordered testimony for the regulator's probe into his $44 billion takeover of Twitter.U.S. District Judge Jacqueline Scott Corley in San Francisco said sanctions over Musk's Sept. 10 absence were unnecessary, after the world's richest person testified on Oct. 3 and agreed to pay the SEC's $2,923 of travel costs. "Because the present circumstances forestall any occasion for meaningful relief that the court could grant, the SEC's request is moot," Corley wrote.The SEC had...