GraphQL: Fix File on nested upload

[Moumouls]

In some mutations due to optimization, url is missing into the file return. So we need to include it into the return.

[davimacedo]

Nice!

[codecov]

Codecov Report

Merging #6507 into master will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #6507      +/-   ##
==========================================
+ Coverage   94.01%   94.04%   +0.03%     
==========================================
  Files         169      169              
  Lines       11825    12259     +434     
==========================================
+ Hits        11117    11529     +412     
- Misses        708      730      +22     

Impacted Files	Coverage Δ
src/GraphQL/transformers/mutation.js	95.86% <100.00%> (-0.73%)	⬇️
src/GraphQL/loaders/defaultRelaySchema.js	91.66% <0.00%> (-3.34%)	⬇️
src/Adapters/Storage/Mongo/MongoStorageAdapter.js	92.79% <0.00%> (-0.68%)	⬇️
src/GraphQL/loaders/defaultGraphQLTypes.js	96.52% <0.00%> (-0.54%)	⬇️
src/GraphQL/loaders/parseClassQueries.js	97.53% <0.00%> (-0.43%)	⬇️
src/GraphQL/loaders/parseClassTypes.js	93.93% <0.00%> (-0.30%)	⬇️
src/RestWrite.js	93.64% <0.00%> (-0.17%)	⬇️
src/Adapters/Auth/apple.js	100.00% <0.00%> (ø)
src/Adapters/Auth/instagram.js	100.00% <0.00%> (ø)
... and 3 more

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