LOS ANGELES — In a ruling that Gov. Jerry Brown says puts a “straitjacket” on local governments trying to fight the severe statewide drought, an appeals court has found that an Orange County city’s tiered-water rates are unconstitutional. The ruling by the 4th District Court of Appeal on Monday against the city of San Juan Capistrano potentially deals a blow to agencies statewide that have used the pricing structure to encourage water conservation. “The practical effect of the court …