JOSE, Venezuela, March 20 (Reuters) - Venezuela's rapidly rising production of foreign-financed synthetic crude is providing the United States with a new stable supply of oil outside the Middle East, according to oil analysts. Amid concerns over Gulf exports, Venezuela Wednesday formally launched its $4 billion Sincor project, slated to give U.S. markets another 180,000 barrels per day (bpd) of light oil, which analysts say will not count as part of the Venezuelan OPEC quota. ``That crude will come straight to the United States, and directly challenge light Saudi Arabian crude at a time when the market is going to...