chore: Add video_usage_key to video microlearning segment events

[macdiesel]

For all changes

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.39%. Comparing base (22c26df) to head (d63306c).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1191      +/-   ##
==========================================
- Coverage   88.40%   88.39%   -0.02%     
==========================================
  Files         396      396              
  Lines        8392     8407      +15     
  Branches     2056     2022      -34     
==========================================
+ Hits         7419     7431      +12     
- Misses        931      934       +3     
  Partials       42       42              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[brobro10000]

One open question, non-blocking about the casing consistency of the segment events. LGTM otherwise 👍🏽