feat: migrate UI5 vitest unit tests to cypress component tests

[chriskari]

Description

Changes proposed in this pull request:

• UI5 components need a proper browser environment to be tested -> move all vitest unit tests of components relying on UI5 components to cypress component tests
• For some vitest unit tests it was sufficient to mock the ui5 dependencies as the focus was not on the component but some functionality
• Some unit tests test pure javascript functionality and could remain untouched
• adjust github actions workflow
• adjusted testing strategy markdowns

Related issue(s)

Definition of done

• The PR's title starts with one of the following prefixes:
  • feat: A new feature
  • fix: A bug fix
  • docs: Documentation only changes
  • refactor: A code change that neither fixes a bug nor adds a feature
  • test: Adding tests
  • chore: Maintainance changes to the build process or auxiliary tools, libraries, workflows, etc.
• Related issues are linked. To link internal trackers, use the issue IDs like backlog#4567
• Explain clearly why you created the PR and what changes it introduces
• All necessary steps are delivered, for example, tests, documentation, merging