fix: Re-add missing rule '@eslint-react/jsx-key-before-spread', closes #1290

[jkbdk]

Bugfix to fix the missing rule described in issue #1290

What kind of change does this PR introduce?

• Bugfix
• Feature
• Docs
• Test
• New Binding issue #___
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change?

• Yes, and the changes were approved in issue #___
• No

Checklist

• When resolving issues, they are referenced in the PR's title (e.g fix: remove a typo, closes #___, #___)
• I have added a convincing reason for adding this feature, if necessary

Other information

[vercel]

@jkbdk is attempting to deploy a commit to the Rel1cx's projects Team on Vercel.

A member of the Team first needs to authorize it.

[Copilot]

Pull Request Overview

This PR re-adds the missing @eslint-react/jsx-key-before-spread rule to the x configuration, resolving issue #1290 where this rule was inadvertently omitted.

Key changes:

• Restored the @eslint-react/jsx-key-before-spread rule with "warn" severity to the x config rules object

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}