Remove more unused attributes in config classes
# What does this PR do?

Remove more unused attributes in config classes.

There are more changes needed than I expected previously. I have to adopt the new test (now only in my branch) in a progressive way and make the changes to pass that test in the same time.

I tried to change more places in single PR to avoid too many PRs related to this topic. But there will still be a few PRs in the future 🙏 .
_The documentation is not available anymore as the PR was closed or merged._