ci(coverage): fix Code Coverage CI task

[overlookmotel]

Fixes #13866.

Skip tasks/website in Code Coverage CI task, because it fails with linker errors.

[overlookmotel]

• ci(coverage): fix Code Coverage CI task #13970 👈 (View in Graphite)
• main

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[overlookmotel]

Seems to work: https://github.com/oxc-project/oxc/actions/runs/17893633240/job/50877345229?pr=13970

[Copilot]

Pull Request Overview

This PR fixes the Code Coverage CI task by excluding the tasks/website package from coverage collection to avoid linker errors with oxlint.

• Updates the codecov cargo alias to exclude the website package
• Adds explanatory comment about the exclusion reason

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