SAST documentation: latest template is referenced in docs
### Documentation :chart_with_upwards_trend: Our documentation does not include information about the [latest template](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/Jobs/SAST.latest.gitlab-ci.yml). This template has features that are unavailable in the regular template (specifically, MR pipeline support). Add a heading to the [SAST docs page](https://docs.gitlab.com/ee/user/application_security/sast/) that covers the current offering available with the `latest` template, while clarifying that it is less stable. #### Success Criteria - [x] Submit a documentation update MR - [x] Pass ~"group::static analysis" review - [x] Pass ~"Technical Writing" review - [x] Merge the update - [x] Update ~"group::static analysis" [OKR](https://gitlab.com/gitlab-com/gitlab-OKRs/-/work_items/8107)
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