Cleanup custom dimensions in request-logging

When using RequestTracking in Arcus.WebApi, we log an obsolete / unused dimension. I believe this is an artefact of the past where we used the `Body` dimension to log the request-body. This has been changed later when we also made it possible to log the response-body.
I think we're now in a stage where we can remove the logging of the `Body` dimension


Next to that, I also see that we log a dimension called `Request` which looks like it contains details about the HTTP Operation, the URL, the Request- and Response body, but also the `Body` dimension


I believe we can remove this one as well ?

Start by locating the RequestTracking request-logging implementation in Arcus.WebApi and trace where the Body and Request dimensions are added. Check the existing logging tests, if present, and confirm that both obsolete dimensions are no longer emitted without removing the request- or response-body logging that replaced them.

Written by the indexing model from the issue text.