Add test core extraction

[rhaidiz]

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• The PR has no duplicates (please search among the Pull Requests
  before creating one)
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• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce?
  Add further test for the extraction of zip cores.

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[CLAassistant]

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[cmaglie]

@rhaidiz would you like to check the errors in the linter: https://github.com/arduino/arduino-cli/pull/941/checks?check_run_id=1111482183#step:6:114

In general, we require that all CI tests pass before merging, (even if sometimes it may happen that the CI build fails for some external causes like downloads or services unavailable).

[rsora]

@rhaidiz you can use the command task check from the repo root folder to launch all the necessary linting checks as the CI does 👍

[rhaidiz]

Sure thing 👍 , updated the commit and now the linter doesn't complain anymore.