Changes to Get training campaign enrollments details

added the optional property enrollments/items/acknowledged_policies to the response with the 200 status

the response property enrollments/items/campaign/employee_title became nullable for the status 200

the response property enrollments/items/completed_at became nullable for the status 200

the response property enrollments/items/has_acknowledged_policy became nullable for the status 200

the response property enrollments/items/started_at became nullable for the status 200

the response property enrollments/items/unenrolled_at became nullable for the status 200

the response property page_after became nullable for the status 200