JS Linting: Remove release version-specific note box

[MaoShizhong]

Because

ESLint's VSCode extension's release version has now been updated to resolve the issue that one of the Linting lesson's note boxes addresses - now v3.0.10 as of this PR.

The v9 support note box also needs to specify that the Eslint: Use Flat Config setting must be disabled if someone follows that step, else it won't recognise the old eslintrc format.

This PR

• Removes version-specific note box for ESLint's VSCode extension
• Specifies enabling Eslint: Use Flat Config in the main ESLint extension instructions
• Specifies disabling Eslint: Use Flat Config in the v9 support note box

Issue

N/A

Additional Information

I really look forward to when ESLint v9 and flat config is widely supported among the community plugins...

Pull Request Requirements

• [x] I have thoroughly read and understand The Odin Project curriculum contributing guide
• [x] The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text
• [x] The Because section summarizes the reason for this PR
• [x] The This PR section has a bullet point list describing the changes in this PR
• [ ] If this PR addresses an open issue, it is linked in the Issue section
• [x] If any lesson files are included in this PR, they have been previewed with the Markdown preview tool to ensure it is formatted correctly
• [x] If any lesson files are included in this PR, they follow the Layout Style Guide

[MaoShizhong]

The linting error is from a missing assignment section. I'll address it as part of the ESM/Webpack rewrite PRs, as that also involves moving template repos away from the lesson.

[CouchofTomato]

There is a linting issue which I'm not sure whether it needs to be addressed. Otherwise it's fine.

[MaoShizhong]

Thanks @CouchofTomato. As per the above comment, I'll address the lint issue in #27962 in due course due to more relevant changes there.