⚡️ Performance: Switch from `picocolors` to Node.js utils styleText?

[JoshuaKGoldberg]

Performance Suggestion Checklist

• I am using the latest version of Mocha.
• I have read and understood the nuances around performance reports.
• I have read and agree to Mocha's Code of Conduct and Contributing Guidelines
• I have searched for related issues and issues with the faq label, but none matched my issue.
• I want to provide a PR to resolve this

Overview

Quoting @Lightning00Blade's #6122 (comment):

Maybe you can correct me if I am wrong but picocolors seems to be used only in the CLI part (NodeJS). So maybe it can be replaced with NodeJS native solution. https://nodejs.org/api/util.html#utilstyletextformat-text-options

Validations

Generally good as part of #6122.

Additional Info

This isn't a 100% sure issue. It might be that there's something missing in the native Node.js solution. TBD.