140 e2e more test cases

[mschwoer]

Quite a lot of changes for one PR, but they are more or less independent:

• refactoring the download of test data (test_data_downloader.py)
• more meta data in neptune (calc_metrics.py)
• more test cases (e2e_test_cases.yml)
• improved github actions for e2e (e2e_testing.yml)