Enable test reports in gitlab

Related issues

Enable test reports in gitlab

Acceptance criteria

• Implemented code changes don't diverge from the related issue.
• Documentation reflects the status quo after merge.
• Pipeline still works.
• GitLab issue is up-to-date.

Proposed squash commit message

Enable test reports in gitlab

Enable storing and uploading of surefire reports in test stage and test step in ci pipeline. All changes made in .gitlab-ci.yml file.

Closes #76 (closed)