Workflows: Add report of unit test results

[nicoprow]

Check and implement what are the possibilities to better display test results in Github for our automated test executions during the Github Checks. It would be nice to see the test results very easily visible with what tests are 'green' and 'red'.

[rainer-exxcellent]

maybe ths is a good github action for this:

https://github.com/EnricoMi/publish-unit-test-result-action