Update unit tests
This MR adds new tests and a small CI update for the unit/integration tests.
1: Unit tests for the train_tools
and evaluation_tools
are provided (not all).
2: New CI handling of the integration and unit tests. The coverage is now calculated correctly.
3: Adding evaluate_model.py
to integration tests from DIPS and UMAMI.
4: Fixing a small issue in the loop over the comparison files. Needed a check if there is a comparison file or not.