fix: squash fiberfailures, introduce "bad request error"

[juliusmarminge]

Closes #777

• Squashes the FiberFailure to its original cause using Cause.squash
• Separates FetchError (where a part of the fetch failed) and BadRequestError for successful requests with "bad statuscode"

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Name	Status	Preview	Comments	Updated (UTC)
docs-uploadthing	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 8, 2024 1:07pm

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🦋 Changeset detected

Latest commit: a2c122e3cde42ddf135d20f0f1a754153a63750a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 7 packages

| Name | Type | | ------------------- | ----- | | uploadthing | Patch | | @uploadthing/shared | Patch | | @uploadthing/nuxt | Patch | | @uploadthing/react | Patch | | @uploadthing/solid | Patch | | @uploadthing/svelte | Patch | | @uploadthing/vue | Patch |

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