Adaptive learning: Add repeated tests to learning paths

[JohannesStoehr]

Checklist

General

• I tested all changes and their related features with all corresponding user types on a test server.
• I chose a title conforming to the naming conventions for pull requests.

Server

• Important: I implemented the changes with a very good performance and prevented too many (unnecessary) and too complex database calls.
• I strictly followed the principle of data economy for all database calls.
• I strictly followed the server coding and design guidelines.
• I added multiple integration tests (Spring) related to the features (with a high test coverage).
• I documented the Java code using JavaDoc style.

Motivation and Context

Feature Proposal: #8758

Description

Adapted scheduling of exercises in the learning path to respect the preferences regarding repeated tests.

This PR does not add any UI!

Steps for Testing

Prerequisites:

• 1 Instructor
• 1 Student

1. Log in to Artemis
2. Create or find a course with a few competencies and linked exercises and lecture units
3. Participate as student in the learning path and check that no errors occur

Testserver States

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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

Performance Tests

• Test 1
• Test 2

Test Coverage

Class/File	Line Coverage	Confirmation (assert/expect)
LearningPathNavigationService.java	89%	✅
LearningPathRecommendationService.java	92%	✅

Summary by CodeRabbit

• New Features
  • Enhanced learning path navigation to indicate when a learning object is a repeated test.
  • Improved recommendations that factor in learner profiles and repeated test scenarios.
• Documentation
  • Added localized labels for repeated tests for a more intuitive user experience.
• Refactor
  • Streamlined navigation and recommendation logic for clearer and more cohesive transitions.
• Tests
  • Expanded test coverage to ensure the new navigation and recommendation features work as expected.
  • Updated assertions in tests to reflect the new repeated test parameter in learning objects.

[Haoyuli2002]

Tested on TS3, works as expected.

[MaximilianAnzinger]

Test adjustments ✅
Also retested on TS3 ✅

[ufukygmr]

LGTM

[az108]

Code 👍

[N0W0RK]

Code

[N0W0RK]

Now actual approval for Code :)