Better JUnit Report Naming

Correct me if I'm wrong, but currently the JUnit Report file generated by the test suite is always called TEST-junit-jupiter.xml and simply put into the working directory of the test suite, which is basically its root folder. This name isn't very intuitive, and it also means that every consecutive run will simply overwrite the report.

I think it would make sense to do two things:

1. Change the file name to something that sounds like a report for the SDC test suite, and add a timestamp for the run, so we do not lose reports when doing multiple runs. I've only glanced at the responsible code, and it seems to me the reporter doesn't actually allow passing a file name, so in case the file name cannot be changed, put the reports in a folder with the appropriate report name.
2. Don't create the reports in the root of the test suite, put them in a reports directory so they can be easily found and don't clutter the tool itself.