Support parseAs option for error reponses in client-fetch

[crtl]

Description

Currently all error responses are expected to be json:

https://github.com/hey-api/openapi-ts/blob/ea24bca1ef3e30e5b6543d4b5b791ca9fb4fd322/packages/client-fetch/src/index.ts#L125C1-L132C1

    let error = await response.text();

    try {
      error = JSON.parse(error);
    } catch {
      // noop
    }

I am currently implementing refresh token logic using response interceptor and I want to use the client to retry the request but this will cause the body to be parsed twice in case of error response.

async function refreshTokenInterceptor(
        response: Response,
        request: Request,
        options: RequestOptions<false> & {_retry?: boolean},
{
  if (response.status !== 401) return response;

  // Refresh token ...

  // this .request() call will call .text() on the response
  // The original .request() call before token was refreshed will call .text() after below request is resolved, 
  // throwing an error because body cant be read twice
  return options.client.request({...options, parseAs: "stream", _retry: true});
}

Passing parseAs: stream circumvents the parsing of the body on success responses but it does not work on error responses.

parseAs should also be applied when parsing error responses.

Package versions are:

"@hey-api/client-fetch": "^0.7.1",
"@hey-api/openapi-ts": "^0.62.3",
```