Development: Replace usage of standard streams with logger calls

[Strohgelaender]

Checklist

General

• I tested all changes and their related features with all corresponding user types on a test server.
• 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.

Motivation and Context

We should not directly use System.out.println() and instead use a logger to make sure the messages are correctly saved into the log file.

Description

Added a new ArchUnit test and replaces all issues found by the test case.

Steps for Testing

code review

Review Progress

Code Review

• Code Review 1
• Code Review 2

[tobias-lippert]

Code

[tobias-lippert]

Reapprove

[bensofficial]

All changes look good to me 👍

[tobias-lippert]

Reapprove

[valentin-boehm]

changes look good

[DominikRemo]

🤩 🚀