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

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

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• I have added a test related to this feature/fix
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[silvester-pari]

Thank you for this deep-dive! It was quite tricky, but I think this is now a great addition to our toolset. Now the only thing left to do is writing more tests 😝