Populate user assignements into PractitionerDetails contained field

[Rkareko]

IMPORTANT: Where possible all PRs must be linked to a Github issue

Fixes #109

Engineer Checklist

• I have written Unit tests for any new feature(s) and edge cases for
  bug fixes
• I have added documentation for any new feature(s) and configuration
  option(s) on the README.md
• I have run mvn spotless:check to check my code follows the project's
  style guide
• I have run mvn clean test jacoco:report to confirm the coverage report
  was generated at plugins/target/site/jacoco/index.html
• I ran mvn clean package right before creating this pull request.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.96%. Comparing base (91d6c85) to head (b0cf899).
Report is 11 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #115      +/-   ##
============================================
+ Coverage     62.72%   62.96%   +0.24%     
- Complexity      220      221       +1     
============================================
  Files            16       16              
  Lines          1470     1477       +7     
  Branches        168      168              
============================================
+ Hits            922      930       +8     
  Misses          460      460              
+ Partials         88       87       -1     

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