update get_proctored_exam_results to DRF

[awais786]

Test via postman

1. Use this URL as post.

expected result

{
"status": "The proctored exam results report is being created. To view the status of the report, see Pending Tasks below."
}

---

Try via instructor dashboard

1. Open this page
2. choose the proctored exam result from drop down and press the button.