Add gitlab-advanced-sast as a SAST job template

Currently (for Experiment), the documentation contains a CI job definition that the user needs to copy-paste (this is the opt-in).

The goal of this issue is to add the job definition to SAST.latest.gitlab-ci.yml.

Explanation

We want to differentiate between the SAST.gitlab-ci.yml and the SAST.latest.gitlab-ci.yml.

So for beta it would be part of the latest, customer would expect it to be included here, and then for GA we add it to the stable template, SAST.gitlab-ci.yml