CIF-2334: remove skus from placeholder data

[buuhuu]

Description

This PR removes the sku's from the productlist's placeholder data. This makes sure that they are not rendered to the markup as data attributes and so are not picked up by the associated content tab.

Related Issue

CIF-2334

How Has This Been Tested?

Unit Tests, Locally

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 #669 (993ef0d) into master (c229a2f) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #669   +/-   ##
=========================================
  Coverage     88.58%   88.58%           
  Complexity     1598     1598           
=========================================
  Files           282      282           
  Lines          7129     7129           
  Branches       1046     1046           
=========================================
  Hits           6315     6315           
  Misses          618      618           
  Partials        196      196           

Flag	Coverage Δ
integration	59.74% <ø> (ø)
jest	85.61% <ø> (ø)
karma	90.01% <ø> (ø)
unittests	89.04% <ø> (ø)

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