CIF-2827: Add produclist XF example

[laurentiumagureanu]

Description

Added example usage of XF placeholder in productlist

Related Issue

CIF-2827

Motivation and Context

How Has This Been Tested?

Manually

Screenshots (if appropriate):

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:

• [x] 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 #299 (8e2d819) into dev (2ad1af4) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##                dev     #299   +/-   ##
=========================================
  Coverage     77.14%   77.14%           
  Complexity       21       21           
=========================================
  Files             1        1           
  Lines            35       35           
  Branches          4        4           
=========================================
  Hits             27       27           
  Misses            6        6           
  Partials          2        2           

Flag	Coverage Δ
unittests	77.14% <ø> (ø)

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[buuhuu]

This change is missing the policy configuration of the styles for the XF in the product list. When editing the product list this causes the css class to be cleared and the XF appears at the bottom of the list.