feat: add LMS user ID field to request payload

[msaha-sonata]

ENT-11161 - Frontend (ENT-10878): Include admin lms_user_id in API request
Added LMS user ID field to request payload to tracks who created this Learner Credit assignment.

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 87.11%. Comparing base (89592af) to head (dd3f16c).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1721   +/-   ##
=======================================
  Coverage   87.11%   87.11%           
=======================================
  Files         781      781           
  Lines       17875    17876    +1     
  Branches     3727     3746   +19     
=======================================
+ Hits        15571    15572    +1     
  Misses       2229     2229           
  Partials       75       75           

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