fix: ensure course about page acknowledges run-based assignments

[adamstankiewicz]

Description

Ensures the course about page recognizes run-based assignments, displaying the Assigned badge and assignment-specific price strikeout messaging in the sidebar on the Course About page. This was supported by slightly refactoring to extend useIsCourseAssigned to utilize the util function determineAllocatedAssignmentsForCourse.

For all changes

• Ensure adequate tests are in place (or reviewed existing tests cover changes)
• Ensure English strings are marked for translation. See documentation for more details.

Only if submitting a visual change

• Ensure to attach screenshots
• Ensure to have UX team confirm screenshots

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.36%. Comparing base (bd4087e) to head (27113ed).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1181   +/-   ##
=======================================
  Coverage   88.36%   88.36%           
=======================================
  Files         396      396           
  Lines        8404     8406    +2     
  Branches     2062     2064    +2     
=======================================
+ Hits         7426     7428    +2     
  Misses        935      935           
  Partials       43       43           

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