We recently ran into an issue where a change was merged to ci-templates
which broken mandatory jobs. Aside from the knock-on effect for other
projects, this broke pipelines in subsequent "fix" MRs which hindered
their rapid approval and merging.

In uis/devops/continuous-delivery/security-policy!53, this project was
exempted from mandatory jobs and we, instead, include the mandatory job
template via `include:local` to ensure that jobs are run. This has the
virtuous side-effect that MRs which fix the mandatory job template will
have their pipelines succeed.

Since the mandatory jobs include the SAST-IaC template, remove the
explicit inclusion from `.gitlab-ci.yml`.

Closes #192

feat(gitlab-ci): include mandatory jobs

Closes #192

See merge request !255