fix(nuxt): remove experimental hash hydration

[harlan-zw]

🔗 Linked issue

Related #22620

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Doing some testing on Nuxt production environments, I believe the HashHydrationPlugin is not ready to be used.

There is an internal issue in Unhead on how non-hydrated dom nodes won't be removed. For users who opt-in and are aware of the constraint it shouldn't be an issue, but for something that we're planning to be enabled by default, I don't think it's worth including it while the issue is present.

Also, it does increase the INP time slightly for page changes so may not be worth it for the performance hit there.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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