fix(nuxt): do not compute useFetch key from headers (reverting #23462)

[webfansplz]

🔗 Linked issue

resolves #23900 #24321

Be related to #23462

❓ 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

📝 Checklist

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

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[danielroe]

We'll need to update the tests as well - we can change them from headers -> query param tests.

nuxt/test/nuxt/composables.test.ts

Lines 259 to 273 in 5625327

	/* @ts-expect-error Overriding auto-key */
	await useFetch('/api/test', { headers: { id: '3' } }, '')
	/* @ts-expect-error Overriding auto-key */
	await useFetch('/api/test', { headers: { id: ref('3') } }, '')
	const headers = new Headers()
	headers.append('id', '3')
	/* @ts-expect-error Overriding auto-key */
	await useFetch('/api/test', { headers }, '')
	/* @ts-expect-error Overriding auto-key */
	await useFetch('/api/test', { headers: [['id', '3']] }, '')
	/* @ts-expect-error Overriding auto-key */
	await useFetch('/api/test', { headers: [['id', ref('3')]] }, '')
	/* @ts-expect-error Overriding auto-key */
	await useFetch('/api/test', { headers: [[computed(() => 'id'), '3']] }, '')
	expect.soft(getPayloadEntries()).toBe(baseCount + 3)

[danielroe]

Thank you!