fix(nuxt): await plugin asyncdata promises in nuxt hook

[eyurkin]

🔗 Linked issue

resolvesnuxt/nuxt#15773

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 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)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Added a check for the presence of currentInstance before calling the vue hook onServerPrefetch

Fix vue warn when calling useFetch in serverPlugin

[Vue warn]: onServerPrefetch is called when there is no active component instance to be associated with. Lifecycle injection APIs can only be used during execution of setup(). If you are using async setup(), make sure to register lifecycle hooks before the first await statement.

Resolvesnuxt/nuxt#15773

📝 Checklist

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

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[vercel]

@eyurkin is attempting to deploy a commit to the Nuxt Team on Vercel.

A member of the Team first needs to authorize it.

[danielroe]

Could we also add a matching test to the fixture?