Exam check for unsubmitted exercises not working for instructors

[muradium]

Describe the bug

On exam checklist,unsubmitted exercises check does not receive updates. It can be observed on the following line that this properties is not computed on the server for the instructors: de/tum/cit/aet/artemis/exam/service/ExamService.java:1134

As the instructor is able to assess unsubmitted exams, I expect that the corresponding check gets updates and informs the instructor. Currently, this check is always marked as complete.

To Reproduce

1. Create a new exam
2. Add a text exercise to the exam
3. Fill all details of the exam required for participation, add a student and generate student exams
4. Participate in the exam as the student, fill an answer to the text exercise, then quit the exam page without submitting your answer
5. As an instructor, open the management page of the exam
6. Finish the exam by editing the exam duration and refresh the page
7. Unsubmitted Exercises check will still be marked as complete, even though there exist unsubmitted exams that have not been assessed

Expected behavior

I expect the instructor to be informed about the unsubmitted exercises when the exam finishes and the corresponding check to be unmarked, until the instructor triggers an assessment of unsubmitted exams.

Screenshots

Which version of Artemis are you seeing the problem on?

7.8.0

What browsers are you seeing the problem on?

Chrome, Safari

Additional context

No response

Relevant log output

No response