CIF-1154 - Support discounts in shopping cart

[herzog31]

Description

• Cart totals now respect discounts.
• Display line item and total prices that also respect discounts.
• Display list of applied discounts.

How Has This Been Tested?

• Jest tests updated

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:

• I have signed the Adobe Open Source CLA.
• 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 #207 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##             master    #207      +/-   ##
===========================================
+ Coverage     59.39%   59.4%   +<.01%     
  Complexity      529     529              
===========================================
  Files           147     147              
  Lines          4334    4335       +1     
  Branches        736     736              
===========================================
+ Hits           2574    2575       +1     
  Misses         1668    1668              
  Partials         92      92

Flag	Coverage Δ	Complexity Δ
#jest	37.6% <ø> (ø)	0 <ø> (ø)	⬇️
#karma	94.97% <100%> (+0.01%)	0 <0> (ø)	⬇️
#unittests	84.3% <ø> (ø)	529 <ø> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
...vigation/v1/navigation/clientlibs/js/navigation.js	98.66% <100%> (+0.01%)	0 <0> (ø)	⬇️

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