feat: show_student_extensions upgrading api to drf compatible ( 9th )

[awais786]

Issues

Verify via postman

1: Try this URL in postman
2: form-data: pass ket as student: admin or your student user name.

expected result

{
    "header": [
        "Unit",
        "Extended Due Date"
    ],
    "title": "Due date extensions for abc qdd (admin)",
    "data": [
        {
            "Unit": "intro to testing",
            "Extended Due Date": "2024-08-31 13:07"
        }
    ]
}

--

Verify via instructor Dashboard

1. Try this URL
2. pass student user name.

expected result

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.