Improve error message about unrealistic result

[hugo-vrijswijk]

If Stryker4s exits too fast, all mutations are survived/killed or maybe some other condition happens, there could be more informative logging.

Example of logging now:

[info] 574 mutant(s) detected as having no code coverage. They will be skipped and marked as NoCoverage
[info] Mutation run finished! Took 23 milliseconds
[info] Total mutants: 574, detected: 0, undetected: 0
[info] Mutation score: n/a%
[info] Written HTML report to /stryker4sdir/target/stryker4s-report/1694730938007/index.html
[success] Total time: 5 s, completed Sep 14, 2023, 4:35:38 PM

We could suggest some possible reasons, debug options (like enabling test-runner stdout) and solutions the user could try to hopefully get Stryker4s working