CIF-1644 - GraphQL requests for staged data should use POST

[cjelger]

This is a workaround to ensure that Magento does not return a cached response for staged data.

How Has This Been Tested?

Manually tested.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes and the overall coverage did not decrease.
• All unit tests pass on CircleCi.
• I ran all tests locally and they pass.

[cjelger]

@mhaack @herzog31 As discussed yesterday, let's use POST so we don't have any issue with Magento caching. I created CIF-1644 and also linked the related Magento issue.

[codecov]

Codecov Report

Merging #403 into master will increase coverage by 9.61%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #403      +/-   ##
============================================
+ Coverage     75.73%   85.34%   +9.61%     
- Complexity      697      932     +235     
============================================
  Files           186      186              
  Lines          4859     4860       +1     
  Branches        690      692       +2     
============================================
+ Hits           3680     4148     +468     
+ Misses          959      563     -396     
+ Partials        220      149      -71     

Flag	Coverage Δ	Complexity Δ
#integration	67.38% <0.00%> (-0.03%)	687.00 <0.00> (ø)
#jest	81.04% <ø> (ø)	0.00 <ø> (ø)
#karma	94.32% <ø> (ø)	0.00 <ø> (ø)
#unittests	85.79% <100.00%> (-7.36%)	870.00 <0.00> (+830.00)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...e/core/components/client/MagentoGraphqlClient.java	70.58% <100.00%> (+36.25%)	12.00 <0.00> (+8.00)
...ommerce/core/examples/servlets/GraphqlServlet.java	75.34% <0.00%> (-17.81%)	30.00% <0.00%> (-10.00%)
...ervices/ComponentsConfigurationAdapterFactory.java	63.63% <0.00%> (ø)	3.00% <0.00%> (ø%)
...e/search/internal/models/SearchResultsSetImpl.java	84.61% <0.00%> (+2.56%)	27.00% <0.00%> (+1.00%)
...rch/internal/services/SearchFilterServiceImpl.java	70.21% <0.00%> (+4.25%)	14.00% <0.00%> (+2.00%)
...nternal/models/v1/productlist/ProductListImpl.java	95.58% <0.00%> (+4.41%)	26.00% <0.00%> (+3.00%)
.../search/internal/models/SearchAggregationImpl.java	96.66% <0.00%> (+6.66%)	16.00% <0.00%> (+2.00%)
...h/internal/models/FilterAttributeMetadataImpl.java	100.00% <0.00%> (+7.69%)	9.00% <0.00%> (+1.00%)
...h/internal/models/SearchAggregationOptionImpl.java	100.00% <0.00%> (+7.69%)	9.00% <0.00%> (+1.00%)
...s/internal/models/v1/product/ProductRetriever.java	100.00% <0.00%> (+8.00%)	34.00% <0.00%> (+3.00%)
... and 39 more

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