CIF-1334 - Set default quantities of grouped products

[cjelger]

• use default quantities of grouped products

How Has This Been Tested?

Extended unit tests and manually tested.

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 #240 into master will increase coverage by 0.11%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #240      +/-   ##
============================================
+ Coverage     61.25%   61.37%   +0.11%     
- Complexity      557      566       +9     
============================================
  Files           149      150       +1     
  Lines          4556     4570      +14     
  Branches        758      758              
============================================
+ Hits           2791     2805      +14     
  Misses         1680     1680              
  Partials         85       85

Flag	Coverage Δ	Complexity Δ
#jest	40.94% <ø> (ø)	0 <ø> (ø)	⬇️
#karma	94.82% <100%> (ø)	0 <0> (ø)	⬇️
#unittests	85.72% <100%> (+0.13%)	566 <9> (+9)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
...ents/internal/models/v1/product/GroupItemImpl.java	100% <100%> (ø)	9 <9> (?)
...onents/internal/models/v1/product/ProductImpl.java	86.6% <100%> (+0.12%)	42 <0> (ø)	⬇️
...merce/product/v1/product/clientlib/js/addToCart.js	97.56% <100%> (ø)	0 <0> (ø)	⬇️

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