Quiz exercises: Migrate to viewChildren/viewChild signals

[MoritzSpengler]

Checklist

General

• This is a small issue that I tested locally and was confirmed by another developer on a test server.
• Language: I followed the guidelines for inclusive, diversity-sensitive, and appreciative language.
• I chose a title conforming to the naming conventions for pull requests.

Client

• I strictly followed the client coding and design guidelines.

Motivation and Context

Migration from Decorators to Signals

Description

I migrated from @ViewChildren and @ViewChild to viewChildren and viewChild signals

Steps for Testing

Exam Mode Testing

Testserver States

You can manage test servers using Helios. Check environment statuses in the environment list. To deploy to a test server, go to the CI/CD page, find your PR or branch, and trigger the deployment.

Review Progress

Performance Review

• I (as a reviewer) confirm that the client changes (in particular related to REST calls and UI responsiveness) are implemented with a very good performance even for very large courses with more than 2000 students.
• I (as a reviewer) confirm that the server changes (in particular related to database calls) are implemented with a very good performance even for very large courses with more than 2000 students.

Code Review

• Code Review 1
• Code Review 2

Manual Tests

• Test 1
• Test 2

Exam Mode Test

• Test 1
• Test 2

Performance Tests

• Test 1
• Test 2

Test Coverage

Screenshots

[github-actions]

End-to-End (E2E) Test Results Summary

	Tests	Passed ✅	Skipped ⚠️	Failed	Time ⏱
End-to-End (E2E) Test Report	201 ran	198 passed	3 skipped	0 failed	58m 14s 942ms

Test	Result	Time ⏱
No test annotations available