General:

* remove unused test system docker-compose
* update package.json with new test packages and updated react-tooltip
* include new test packages in setupTests.js
* update gitlab ci/cd pipeline
* update readme

Test fixing:

* update mocked template schemas with production versions
* remove outdated test data mock + functionality to retrieve it
* remove test console errors for react v17-v18 with mock spy in testHelper.js
* create generic test helper functions
* refactor create.test for Scheduling
* fix found bugs in create for Scheduling via (unit tested) create.helper
* format create for Scheduling
* Add TODO to increase test coverage + removal of preparationSchemas