fix: allow reading body from non-2xx responses in net.request (#21055)

* fix(urlrequest): allow non-2xx repsponse results

- closes #21046

* test(net): add test cases to verify non-2xx body

* test(session): update spec to match clientrequest behavior

* test(net): update test cases to match clientrequest behavior

* spec: clean up async net spec

shell/browser/api/atom_api_url_request.cc

@@ -286,6 +286,8 @@ bool URLRequest::Write(v8::Local<v8::Value> data, bool is_last) {
     network::ResourceRequest* request_ref = request_.get();
     loader_ = network::SimpleURLLoader::Create(std::move(request_),
                                                kTrafficAnnotation);
+
+    loader_->SetAllowHttpErrorResults(true);
     loader_->SetOnResponseStartedCallback(
         base::Bind(&URLRequest::OnResponseStarted, weak_factory_.GetWeakPtr()));
     loader_->SetOnRedirectCallback(