Create a jtharness_raw test target

In order to run jtharness directly (without the JavaTestUtil class in the way), we can add a disabled target that could then be run when needed (and used to automate the auto-manuals list). It's `` would call javatest executable directly with jti file on the commandline (possibly passed in via APPLICATION_OPTIONS parameter).

Start by locating the existing jtharness targets and the JavaTestUtil integration in the test infrastructure. Check how targets accept APPLICATION_OPTIONS and how the javatest executable and jti files are currently invoked; done means a disabled jtharness_raw target can run javatest directly when enabled.

Written by the indexing model from the issue text.