Reflect `gitlab:duo:setup` improvements in AI dev docs
In !156511 (merged), we updates gitlab:duo:setup
to reflect latest changes, and to support self-managed use. It was previously specific to .com simulation.
The rake task will ensure all necessary FFs are set up and add-on purchases in the DB, so we don't need to have a local CDot instance running to develop AI.
We should reflect that in https://docs.gitlab.com/ee/development/ai_features/index.html
Also: we need to mention that you should be a Guest
in a group for which you do a setup (see !156511 (comment 1956164492))
Additionally, we may want to cover that we use self-signed tokens in development (in both cases: SaaS & SM): !156496 (merged)
Edited by Aleksei Lipniagov