chore: enable one-var rule

[sviat9440]

PR Checklist

• Addresses an existing open issue: fixes Repo: Enable one-var internally #6405
• That issue was marked as accepting prs
• Steps in Contributing were taken

[typescript-eslint]

Thanks for the PR, @sviat9440!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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[JoshuaKGoldberg]

Super, thanks @sviat9440!

I know I've been a little slow on your PRs in the past, so it brings me joy to get this one in quickly. 😅