Removed test dependency on Sql#preCheckForNamedParams(String) and deprecated method

Only reference I could find to `Sql#preCheckForNamedParams(String)` was in a test.  With commit 69c7e47a9cb0957ee0cbb5125a2a137c642a009f this test no longer needs to rely on access to that method, so seemed like a good opportunity to move the test and deprecate the public method.