Fix exceptions in `irrelvance_common` predicates

Closes #63

See merge request cogsys/dare2del/demonstrator!29

add unit test

Fix pipeline errors

See merge request cogsys/dare2del/demonstrator!28

This reverts commit 6437fc70

Resolve "Automate API-tests"

Closes #62, #52, #51, and #23

See merge request cogsys/dare2del/demonstrator!22

Create dummy jobs only for MR into other branches.

System Tests

See merge request cogsys/dare2del/demonstrator!26

adapted new schema filenames