Review logging in 2.0: exclude user data from certain logs

[Timoeller]

Is your feature request related to a problem? Please describe.
We want to review logging for 2.0 and exclude user data (queries, answers, file content, documents, feedback?, X?) from certain log levels.

We still want this user data to be logged somehow, so consumers of those logs can decide what they log or not.

Usage examples

1. You want to send logs to a third party SaaS solution (like datadog): it might be required by law to remove all user information.
2. You deploy your own onprem logging solution: you might be interested in collecting and visualizing all user-related data.

[Timoeller]

Since it does not introduce major changes to the API we will remove the milestone for this item.