CIF-2686 - Filter by category in product list component UI

[LSantha]

• enabled category filter for product list, only direct child categories are included
• updated unit tests

Related Issue

CIF-2686

How Has This Been Tested?

Manually, unit tests, UI tests.

Types of changes

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

Checklist:

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

[codecov[bot]]

Codecov Report

Merging #921 (62d3b81) into master (a510ff9) will increase coverage by 0.00%. The diff coverage is 90.90%.

@@            Coverage Diff            @@
##             master     #921   +/-   ##
=========================================
  Coverage     89.43%   89.43%           
- Complexity     2002     2013   +11     
=========================================
  Files           332      333    +1     
  Lines          8885     8927   +42     
  Branches       1314     1316    +2     
=========================================
+ Hits           7946     7984   +38     
- Misses          668      670    +2     
- Partials        271      273    +2     

Flag	Coverage Δ
integration	52.29% <23.63%> (-0.40%)	:arrow_down:
jest	86.38% <ø> (ø)
karma	95.26% <ø> (ø)
unittests	88.76% <90.90%> (+0.01%)	:arrow_up:

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

Impacted Files	Coverage Δ
...ch/internal/services/SearchResultsServiceImpl.java	95.67% <ø> (-0.08%)	:arrow_down:
...ce/core/search/models/SearchAggregationOption.java	0.00% <0.00%> (ø)
...nternal/models/v1/productlist/ProductListImpl.java	90.47% <90.24%> (+0.25%)	:arrow_up:
...ernal/models/v1/productlist/CategoryRetriever.java	100.00% <100.00%> (ø)
...h/internal/models/SearchAggregationOptionImpl.java	100.00% <100.00%> (ø)

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