clean up testsuite ci task

.gitlab-ci.yml

@@ -282,11 +282,7 @@ tests-and-coverage:
   stage: "Unit Tests"
   needs: []
   image: i10git.cs.fau.de:5005/pycodegen/pycodegen/nox:ubuntu24.04-cuda12.6
-  before_script:
-    - pip install -e .[tests]
   script:
-    - env
-    - pip list
     - mkdir -p ~/.config/matplotlib
     - echo "backend:template" > ~/.config/matplotlib/matplotlibrc
     - mkdir public