Update `extractResponseBody()` to accept `Response`s and use generic type instead of `any`

There isn't any reason we should only match `AnyResponseError` since the logic could be helpful for any `Response`s we get from direct fetch requests. Plus we want to get away from `any` usage in general, so callers should have somewhat of an idea what to expect.

https://github.com/confluentinc/vscode/blob/fac15b41a3554e28e1273eab4e498d99d01b0d30/src/errors.ts#L63