Development: Fix cases of ignored return values

[Strohgelaender]

Checklist

General

• Language: I followed the guidelines for inclusive, diversity-sensitive, and appreciative language.
• 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) database calls.
• I strictly followed the server coding and design guidelines.

Motivation and Context

Methods like assertThat() or isAtLeastStudentInCourse() have return values that should not get ingored. This PR fixes cases where a method returns something, which later gets ignored.

Steps for Testing

code review

Review Progress

Code Review

• Code Review 1
• Code Review 2

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Commits

Files that changed from the base of the PR and between 2822d79 and b59ab0e.

Walkthrough

The recent updates involve refining authorization checks, enhancing logic for resolving posts, and improving method efficiency in various Java classes. Changes also include modifying exception handling in web resources and refining integration tests to assert new conditions. These alterations aim to improve code reliability, maintainability, and ensure that operations adhere strictly to defined roles and conditions.

Changes

File Path	Change Summary
.../plagiarism/PlagiarismAnswerPostService.java	Updated authorization checks and logic for resolving posts.
.../tutorialgroups/TutorialGroupService.java	Minor formatting change by removing an empty line.
.../metis/conversation/ChannelResource.java	Modified exception handling from ifPresentOrElse to ifPresent.
.../metis/ConversationIntegrationTest.java	Updated test logic to include assertions for channel properties in course-wide conversations.
.../tutorialgroups/TutorialGroupSessionIntegrationTest.java	Adjusted method call in integration test to remove redundant method chaining.

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[krusche]

Code looks good 👍