Convert SqlServerRegressionTest to use the FitNesseSuite runner

JUnitRunner has been removed from the latest versions of Fitnesse.

This change means that these tests will continue to at least compile, but to be honest, I don't know what to do with them. These obviously need an SqlServer instance to run, I haven't run them in a very long time because of the hassle and so I don't know whether they even pass anymore.