Remove npm packages which where falsely introduced to fix a ci issue, which was in fact just a very old node image.

https://pages.cms.hu-berlin.de/iqb/ci_cd/responses/

#10

- Upgrade dependencies
- Refactor tests not to rely on removed stateReportPolicy anymore

The chunks in unitState.dataParts shall be strings and nothing but strings as stated in the verona2+ specification. I interpreted this a little bit more open before, and stores JSON data in it, which lead to compatibility issues.