CIF-1188 - Use default implementations in Sling models consistently

[cjelger]

• removed all "default" methods in sling model interfaces

[codecov]

Codecov Report

Merging #199 into master will increase coverage by 0.23%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #199      +/-   ##
============================================
+ Coverage     59.06%   59.29%   +0.23%     
  Complexity      526      526              
============================================
  Files           149      146       -3     
  Lines          4348     4331      -17     
  Branches        726      726              
============================================
  Hits           2568     2568              
+ Misses         1683     1666      -17     
  Partials         97       97

Flag	Coverage Δ	Complexity Δ
#jest	37.56% <ø> (ø)	0 <ø> (ø)	⬇️
#karma	94.96% <ø> (-5.04%)	0 <ø> (ø)
#unittests	83.64% <ø> (+0.93%)	526 <ø> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
...ctteaser/v1/productteaser/clientlibs/js/actions.js	92.3% <0%> (ø)	0% <0%> (ø)	⬇️
...merce/product/v1/product/clientlib/js/addToCart.js	96.42% <0%> (ø)	0% <0%> (ø)	⬇️
...ommerce/product/v1/product/clientlib/js/gallery.js	94.87% <0%> (ø)	0% <0%> (ø)	⬇️
...vigation/v1/navigation/clientlibs/js/navigation.js	98.64% <0%> (ø)	0% <0%> (ø)	⬇️
...ps/core/cif/clientlibs/common/js/PriceFormatter.js	90.9% <0%> (ø)	0% <0%> (ø)	⬇️
...ommerce/product/v1/product/clientlib/js/product.js	96.29% <0%> (ø)	0% <0%> (ø)	⬇️
...ctlist/v1/productlist/clientlibs/js/productlist.js	93.61% <0%> (ø)	0% <0%> (ø)	⬇️
...ore/cif/clientlibs/common/js/CommerceGraphqlApi.js	88.33% <0%> (ø)	0% <0%> (ø)	⬇️
...product/v1/product/clientlib/js/variantSelector.js	98.3% <0%> (ø)	0% <0%> (ø)	⬇️

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[mhaack]

Verified