Test fit results

[henrikef]

Unless I'm missing something, test_geminga_paper seems to be the only one that actually compares the best-fit parameters to expected values. The other tests just run through the analysis and pass if there is no crash.
We should implement similar checks on the fit results for existing tests e.g. test_complete_analysis, and also something similar for the TS values etc.

[github-actions]

This issue has become stale. Is there an update? We will close in 14 days