Fix: Updates extra-data to match the latest mdn. (with tests)

[vidorteg]

Pull request checklist

Make sure you:

• [ ] Signed the Contributor License Agreement (after creating PR)
• [ ] Followed the commit message guidelines

For non-trivial changes, please make sure you also:

• [ ] Added/Updated related documentation.
• [ ] Added/Updated related tests.

Short description of the change(s)

The latest yarn.lock update brought mdn.css.types.color to the latest shape: https://github.com/mdn/browser-compat-data/commit/04c35fdc59a052cb8580c6739408678d742eb6be

This PR updates extra-data.js to the match the latest shape.

It also add an unrelated test as it is now failing the test coverage threshold which prevents check in.

[vidorteg]

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