Moves the ChangeUserAdminStatusRequest to the ApiModels folder.
Updates the admin controller route to "admin" and the admin status
endpoint to "adminStatus".
Makes the ChangeUserAdminStatus method asynchronous.
Uses NotFoundException instead of KeyNotFoundException.
Establishes a link between DbUserProfile and DbApplicationUser,
allowing for better management of user-related information
and integration with ASP.NET Identity.
Renames DbUser to DbUserProfile and updates related entities and configurations.