Create new vendored template for IaC security scanning

There is still a good bit to be determined for this, but this comment and this thread are the latest.

Implementation plan

• Create template under /lib/gitlab/ci/templates/Jobs with initial content !73074 (merged)
• Create template under /lib/gitlab/ci/templates/Security once the template is ready for initial use by customers !73076 (merged)

We will take a two step process here to avoid the template showing up as an option in the New file -> .gitlab-ci.yml -> Apply a template flow before it is ready.