Fix front-end tests + refactoring

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• remove outdated test data mock + functionality to retrieve it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

added 1 commit

• 610b1a4d - remove unfinished createTemplateSchemaMockFiles

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added 2 commits

• c0e4f40c - update ci/cd front-end pipeline; remove timeout, remove beforescript, remove...
• a3bd4e8d - update readme: new docker-compose file with link to container registry, remove...

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marked this merge request as ready

requested review from @jkuensem

changed the description

added 1 commit

• b56b616a - minor update readme for pipeline run

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Really nice to see the pipeline green again!

added 3 commits

• 9a87432a - merge tests
• 98b753a4 - extract groups to function, remove duplicate function wrt create.helper
• 0b39b4b6 - add TODO with ticket

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resolved all threads

enabled an automatic merge when the pipeline for 0b39b4b6 succeeds

merged

mentioned in commit 7ec358e5