[playground] Refactor ConfigEditor to use <Activity> component

[0xlau]

Summary

This PR addresses a pending TODO comment left in #34499

https://github.com/facebook/react/blame/eb2f784e752ba690f032db4c3d87daac77a5a2aa/compiler/apps/playground/components/Editor/ConfigEditor.tsx#L37

This change removes the temporary workaround and replaces it with <Activity>, as originally intended.

How did you test this change?

• Updated the component to use <Activity> directly
• Verified the editor renders correctly in both development and production builds.
• The <Activity> UI updates as expected.

Arc.mp4

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[EugeneChoi4]

Thanks for the @0xlau! Glad to see they finally made monaco-editor compatible with Activity. I'll be able to merge once you sign the CLA!

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