_http_collect_response now returns an 'ERROR' response when requests times out

Currently, when a request times out, the function returns a "SUCCESS" response. My changes fix this bug.

Author: TheOtherBrian1

sql/pg_net.sql

@@ -305,15 +305,15 @@ begin
     from net._http_response
     where id = request_id;
 
-    if rec is null then
+    if rec is null or rec.error_msg is not null then
         -- The request is either still processing or the request_id provided does not exist
 
         -- TODO: request in progress is indistinguishable from request that doesn't exist
 
         -- No request matching request_id found
         return (
             'ERROR',
-            'request matching request_id not found',
+            coalesce(rec.error_msg, 'request matching request_id not found'),
             null
         )::net.http_response_result;