Use `-derivedDataPath` on `testSourceKittenFrameworkDocsAreValidJSON`
Use `-derivedDataPath` on `testSourceKittenFrameworkDocsAreValidJSON`

By applying this, intermediate files built during the current test session will be maintained before and after `testSourceKittenFrameworkDocsAreValidJSON()` execution, and the time to test re-execution will be shorter.

jpsim/SourceKitten,jpsim/SourceKitten,jpsim/SourceKitten,jpsim/SourceKitten,jpsim/SourceKitten