fix(directAccess): Properly handle response status

[dplewis]

Should handle response the same way JS SDK RESTController, Single Save and Batch Save does.

• Fix RestWrite location helper
• Properly return status code
• Ensure object.existed() works
• Ensure batch endpoint returns proper response

[ghost]

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[codecov]

Codecov Report

Merging #6966 into master will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #6966      +/-   ##
==========================================
- Coverage   93.83%   93.81%   -0.02%     
==========================================
  Files         169      169              
  Lines       12271    12278       +7     
==========================================
+ Hits        11514    11519       +5     
- Misses        757      759       +2     

Impacted Files	Coverage Δ
src/ParseServerRESTController.js	98.38% <100.00%> (+0.20%)	⬆️
src/RestWrite.js	93.66% <100.00%> (-0.32%)	⬇️
src/Adapters/Storage/Mongo/MongoStorageAdapter.js	93.58% <0.00%> (-0.23%)	⬇️
src/vendor/mongodbUrl.js	100.00% <0.00%> (ø)
src/PromiseRouter.js	90.10% <0.00%> (+1.09%)	⬆️

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[dplewis]

@davimacedo I edited the original post.

[mtrezza]

Lgtm