chore: code coverage

[radupasparuga]

Implemented changes

This PR adds code coverage to our cypress tests using Istanbul (https://github.com/ifaxity/vite-plugin-istanbul)

TODO:

• add code coverage to component tests
• TBD: add Codecov to this repository for comments that show code coverage changes on PRs (example of how it would look skip yarn radupasparuga/cypress-realworld-app#3)

How to use:

• npm run test:component (this will generate a coverage and a .nyc_output folder that contain info about our code coverage

• npm run nyc:report to show a summary of code coverage
  

• opening coverage/lcov-report/index.html opens a nice interface where we can view coverage information for each file
  

• coverage is also added as a step in our run-tests pipeline (https://github.com/EOX-A/EOxElements/actions/runs/10873667192/job/30170032260?pr=1207), the "Code coverage" step displays the output of the npm run nyc:report command and the "Upload code coverage" step uploads the coverage/lcov-report folder as an artifact
  

Closes #638

Screenshots/Videos

Checklist before requesting a review

• I have performed a self-review of my code
• I have added a test related to this feature/fix
• For new features: I have created a story showcasing this new feature
• All checks have passed
• The PR title follows conventional commit style and reflects the type of change (major/minor/patch, breaking)
• The PR title describes the change within this element (each merged PR equals one entry in the element's changelog!)

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