CIF-1231 - fix featured category placeholder display

[mhaack]

Description

Fix featured category placeholder display in publish mode. The component was switched to the WCM core components placeholder template and displays two different placeholders, based on the state. The component distinguishes between configured vs. not configured and configured but no category data available.

Author (edit): placeholder if not configured or configured but no category data
Author (preview) & publish: no place holder

Related Issue

CIF-1231

Motivation and Context

Don't display placeholders on publish and unify placeholder usage.

Screenshots (if appropriate):

Component not configured:

Component configured, but no category data availbale:

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 #200 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #200      +/-   ##
============================================
- Coverage     59.29%   59.26%   -0.04%     
- Complexity      526      527       +1     
============================================
  Files           146      146              
  Lines          4331     4330       -1     
  Branches        726      726              
============================================
- Hits           2568     2566       -2     
  Misses         1666     1666              
- Partials         97       98       +1     

Flag	Coverage Δ	Complexity Δ
#jest	37.56% <ø> (ø)	0.00 <ø> (ø)	⬆️
#karma	94.96% <ø> (ø)	0.00 <ø> (ø)	⬆️
#unittests	83.56% <80.00%> (-0.08%)	527.00 <2.00> (+1.00)

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