CIF-1965 - Show staged flag in productlist component

[cjelger]

This PR is pretty similar to #510 but for the productlist component.

The related css changes for Venia are in adobe/aem-cif-guides-venia#118

How Has This Been Tested?

Added unit tests and update the mock GraphQL server used by the Venia ITs.

Screenshots (if appropriate):

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.

[codecov]

Codecov Report

Merging #519 (17f1a4b) into 2.0.0-ee (a0db3e0) will increase coverage by 0.00%.
The diff coverage is 90.47%.

@@             Coverage Diff             @@
##             2.0.0-ee     #519   +/-   ##
===========================================
  Coverage       87.68%   87.68%           
- Complexity       1244     1254   +10     
===========================================
  Files             234      236    +2     
  Lines            5893     5910   +17     
  Branches          861      862    +1     
===========================================
+ Hits             5167     5182   +15     
- Misses            573      574    +1     
- Partials          153      154    +1     

Flag	Coverage Δ	Complexity Δ
integration	64.59% <23.80%> (-0.26%)	0.00 <12.00> (ø)
jest	83.33% <ø> (ø)	0.00 <ø> (ø)
karma	94.54% <ø> (ø)	0.00 <ø> (ø)
unittests	88.07% <90.47%> (+<0.01%)	0.00 <12.00> (ø)

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

Impacted Files	Coverage Δ	Complexity Δ
...nternal/models/v1/productlist/ProductListImpl.java	94.80% <ø> (ø)	37.00 <0.00> (ø)
...core/components/models/common/ProductListItem.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...nternal/models/v2/productlist/ProductListImpl.java	85.71% <85.71%> (ø)	6.00 <6.00> (?)
...internal/models/v1/common/ProductListItemImpl.java	86.95% <100.00%> (+0.59%)	21.00 <1.00> (+1.00)
...models/v1/productcarousel/ProductCarouselImpl.java	86.15% <100.00%> (+0.21%)	26.00 <0.00> (ø)
...models/v1/relatedproducts/RelatedProductsImpl.java	86.95% <100.00%> (ø)	17.00 <0.00> (ø)
...ore/components/models/productlist/ProductList.java	100.00% <100.00%> (ø)	1.00 <1.00> (?)
...ts/models/retriever/AbstractCategoryRetriever.java	84.09% <100.00%> (+1.59%)	16.00 <4.00> (+2.00)
.../converters/ProductToProductListItemConverter.java	95.83% <100.00%> (+0.18%)	3.00 <0.00> (ø)
... and 1 more

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