feat: [FC-86] Added plugin slots for the course about sidebar

[PKulkoRaccoonGang]

Description

Added plugin-slots for Course About sidebar.

Useful information

• Figma design
• Catalog About Page API Design
• courses.html

Initial setup

1. Clone and install the tutor-mfe plugin from the draft PR that adds support for Catalog MFE.
2. Go to http://apps.local.openedx.io:1998/catalog/courses/<course_id>/about

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.78%. Comparing base (26f4fb3) to head (43bf564).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #62   +/-   ##
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  Coverage   98.77%   98.78%           
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  Files          96       97    +1     
  Lines         981      986    +5     
  Branches      167      160    -7     
=======================================
+ Hits          969      974    +5     
  Misses         12       12           

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[brian-smith-tcril]

LGTM!

It'd be nice to add an example that uses the pluginProps, but I don't want to block this PR on that.