CIF-1995 - Update CIF integration tests to Magento 2.4.2 EE

[cjelger]

• update Magento schema to 2.4.2 EE
• add mandatory "staged" field to the mock JSON responses
• extend unit tests to test both product v1 and v2 components
• fix POM dependencies and remove no longer needed picker implementation

Motivation

We need this when we change the Venia product component to v2, because we use the mock GraphQL server from the components library to test Venia. So we will have to support the staged field.

How Has This Been Tested?

Extended unit tests for both product v1 and v2

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 #515 (b1bcfa6) into CIF-1964-v2 (7d73c06) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@                Coverage Diff                @@
##             CIF-1964-v2     #515      +/-   ##
=================================================
+ Coverage          87.61%   87.66%   +0.04%     
  Complexity          1240     1240              
=================================================
  Files                233      233              
  Lines               5887     5886       -1     
  Branches             861      861              
=================================================
+ Hits                5158     5160       +2     
+ Misses               574      573       -1     
+ Partials             155      153       -2     

Flag	Coverage Δ	Complexity Δ
integration	64.89% <100.00%> (+0.02%)	0.00 <1.00> (ø)
jest	83.33% <ø> (ø)	0.00 <ø> (ø)
karma	94.54% <ø> (ø)	0.00 <ø> (ø)
unittests	88.04% <100.00%> (+0.05%)	0.00 <1.00> (ø)

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Impacted Files	Coverage Δ	Complexity Δ
...ommerce/core/examples/servlets/GraphqlServlet.java	92.30% <100.00%> (+1.22%)	41.00 <1.00> (ø)
...e/search/internal/models/SearchResultsSetImpl.java	87.17% <0.00%> (+2.56%)	27.00% <0.00%> (ø%)

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[cjelger]

Will be "verified" with #510 and the corresponding Venia PR