tech debt: cleanup organic-traffic disabled from audit config

**Description**
organic-traffic was initially developed as an audit for which we introduced disabled: true by default, since we were going to selectively enable it due to costs reasons.
Now that organic-traffic is a metric import and uses the imports configuration instead, we should cleanup the organic-traffic disabled from all future and existing audit configs.

Start by locating the existing and future audit configurations and the imports configuration for organic-traffic. Remove the obsolete disabled setting from those configurations, and verify that organic-traffic is controlled through imports configuration instead.

Written by the indexing model from the issue text.