Fetch artifacts with gitlab API

Summary

Read other repos

To make a summary test report with the list of UCs matching the release plan it is helpful to fetch *.xml artifacts from other repositories. There are ways to do this in jobs directly, but not in free gitlab.

This also allows to more easily re-run test report generation locally without re-running tests.

Since this gitlab manipulation is already included here, I think the gantt generation stuff is not that far off (although I realize the distance between CI pipeline code and the gantt generation is not small).

Deployment UCs

Add "deployment UCs" in the config, demonstrated by simple "test" job passing