fix(eslint-plugin): [no-floating-promises] revert disable of ignoreVoid in strict config

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes Docs: differences between recommended and strict configs not mentioned on the website #8712
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

Reverts specifically the part of #8364 that had no-floating-promises disable allowing void in the strict-type-checked config.

[typescript-eslint]

Thanks for the PR, @JoshuaKGoldberg!

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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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• nx test utils --coverage=false
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