[Admin Panel Setting 3/4] Backend logic for the logging field variation setting

What does this MR do and why?

This is the second MR to split up the changes of !233809 (closed).

The overall approach is to introduce a new application setting that will be controlled via GitLab and be consumed by several services to change the logging fields they emit. With this approach we enable a fast internal migration while giving customers the chance to migrate at their own pace.

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How to set up and validate locally

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