By Eduardo BaptistaBEIJING, March 4 (Reuters) - Weeks before U.S.–Israeli strikes in Iran, wide swathes of state-backed Chinese companies were eyeing projects in areas from energy and heavy industry to trade promotion, data showed, spotlighting the risks the war presents for business in China.One of Iran's closest allies and the biggest buyer of its oil, China has so far kept silent about the business and trade impact of the attacks, though it condemned the U.S.-led operation as "unacceptable" a...