PyAthenaTests: delete unused package
None of the files in this package are used anywhere, has not seen relevant updates in years and despite its name it does not define any unit tests.
GitLab jobs artifacts no longer stored forever as of Monday, November 4th 08:30h. Further information under https://cern.ch/otg0152576
None of the files in this package are used anywhere, has not seen relevant updates in years and despite its name it does not define any unit tests.