🛠 Repo: Enable eslint-plugin-n in ESLint config

[Josh Goldberg ✨]

Tooling Suggestion Checklist

• I have tried restarting my IDE and the issue persists.
• I have pulled the latest master branch of the repository.
• 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

eslint-plugin-node is a devDependency in package.json:

mocha/package.json

Line 95 in 645469e

 "eslint-plugin-node": "^11.1.0", 

...but not used in the ESLint config.

The eslint-plugin-n plugin (the successor to eslint-plugin-node) is actually useful though. Let's enable from its recommended preset config?

Additional Info

The devDependency is being removed in #5060, but that's just because it's unused. This issue is suggesting adding it (well, eslint-plugin-n) back.