By Herbert Lash and Danilo Masoni NEW YORK/MILAN (Reuters) – A gauge of global equity markets rose slightly on Tuesday while 10-year U.S. Treasury yields slid from 3% amid investor caution ahead of the biggest single-day rate hike expected by the U.S. Federal Reserve since 2000. In a sign of the challenge the Fed faces in subduing rising consumer prices, data showed U.S. job openings hit a record in March as worker shortages persisted, suggesting employers may raise wages in a move that would likely fuel inflation. The Fed is expected to hike rates by half a percentage point at the end of a po…

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