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>

spec/batch.spec.js

@@ -219,9 +219,9 @@ describe('batch', () => {
                 expect(databaseAdapter.createObject.calls.argsFor(0)[3]).toBe(
                   databaseAdapter.createObject.calls.argsFor(1)[3]
                 );
-                expect(results.map(result => result.get('key')).sort()).toEqual(
-                  ['value1', 'value2']
-                );
+                expect(
+                  results.map(result => result.get('key')).sort()
+                ).toEqual(['value1', 'value2']);
                 done();
               });
             });