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**Related issue:** Resolves#38234
Addresses Ian's suggestion from activity bounded context code review.
# Checklist for submitter
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
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## Summary by CodeRabbit
* **Refactor**
* Updated user lookup functionality across the system to return minimal
user information instead of full user objects. Changes affect multiple
system interfaces and data access layers to optimize performance and
reduce data payload for user-related operations throughout the
application.
<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
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