GraphQL: Optimize queries, fixes some null returns (on object), fix stitched GraphQLUpload (#6709)

* Optimize query, fixes some null returns, fix stitched GraphQLUpload

* Fix authData key selection

* Prefer Iso string since other GraphQL solutions use this format

* fix tests

Co-authored-by: Antonio Davi Macedo Coelho de Castro <adavimacedo@gmail.com>

src/batch.js

@@ -25,7 +25,7 @@ function makeBatchRoutingPathFunction(originalUrl, serverURL, publicServerURL) {
   const apiPrefixLength = originalUrl.length - batchPath.length;
   let apiPrefix = originalUrl.slice(0, apiPrefixLength);
 
-  const makeRoutablePath = function(requestPath) {
+  const makeRoutablePath = function (requestPath) {
     // The routablePath is the path minus the api prefix
     if (requestPath.slice(0, apiPrefix.length) != apiPrefix) {
       throw new Parse.Error(
@@ -41,7 +41,7 @@ function makeBatchRoutingPathFunction(originalUrl, serverURL, publicServerURL) {
     const publicPath = publicServerURL.path;
     // Override the api prefix
     apiPrefix = localPath;
-    return function(requestPath) {
+    return function (requestPath) {
       // Build the new path by removing the public path
       // and joining with the local path
       const newPath = path.posix.join(