fix context for cascade-saving and saving existing object

[mtrezza]

Fixes issues with context when saving objects:

1. Fixes issue that no context is set when saving an existing object:

const obj = new Parse.Object("TestObject");
await obj.save(null);
await obj.save(null, { context: { a: 'a' } });

2. Fixes issue that context is lost when cascade-saving objects so that context is inherited by child objects (obj2 in this example):

const obj = new Parse.Object("TestObject");
const obj2 = new Parse.Object("TestObject2");
obj.set("obj2", obj2);
await obj.save(null, { context: { a: 'a' } });

Requires:

• Changes in Parse JS SDK fix context when cascade-saving objects Parse-SDK-JS#1186

closes #6736

[dplewis]

Thanks for bumping the SDK, I was waiting for the PR from Synx. Can you run npm install to update the package lock?

[mtrezza]

Yes, it's already running. I gotta head out now, if CI fails I'll take a look at it in a couple of hours.

[dplewis]

It looks good to me, can you remove the comments that are self documenting?

[mtrezza]

You mean these // Save object comments and alike in the tests ?

[codecov]

Codecov Report

Merging #6735 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #6735      +/-   ##
==========================================
- Coverage   93.89%   93.88%   -0.01%     
==========================================
  Files         169      169              
  Lines       12047    12048       +1     
==========================================
  Hits        11311    11311              
- Misses        736      737       +1     

Impacted Files	Coverage Δ
src/RestWrite.js	93.67% <100.00%> (-0.17%)	⬇️
src/batch.js	92.00% <100.00%> (+0.16%)	⬆️

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[mtrezza]

Looks like a false positive in coverage, ready to merge.

[dplewis]

LGTM!