fix: Updated courseKey with courseTitle for charts

[irfanuddinahmad]

For all changes

• Ensure adequate tests are in place (or reviewed existing tests cover changes)

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 85.59%. Comparing base (d78920c) to head (6746379).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1304      +/-   ##
==========================================
- Coverage   85.60%   85.59%   -0.01%     
==========================================
  Files         575      575              
  Lines       12672    12672              
  Branches     2691     2648      -43     
==========================================
- Hits        10848    10847       -1     
- Misses       1762     1764       +2     
+ Partials       62       61       -1     

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[mahamakifdar19]

I believe we should truncate long titles. We can set a character limit and ensure that titles are truncated at word boundaries and an ellipsis is added at the end to indicate truncation.