* fix: populate user_id and user_info for admin users in /user/info endpoint
Fixes#22179
When admin users call /user/info without a user_id parameter, the endpoint
was returning null for both user_id and user_info fields. This broke
budgeting tooling that relies on /user/info to look up current budget and spend.
Changes:
- Modified _get_user_info_for_proxy_admin() to accept user_api_key_dict parameter
- Added logic to fetch admin's own user info from database
- Updated function to return admin's user_id and user_info instead of null
- Updated unit test to verify admin user_id is populated
The fix ensures admin users get their own user information just like regular users.
* test: make mock get_data signature match real method
- Updated MockPrismaClientDB.get_data() to accept all parameters that the real method accepts
- Makes mock more robust against future refactors
- Added datetime and Union imports
- Mock now returns None when user_id is not provided
