With the introduction of mandatory jobs via pipeline execution policies,
it is important that the common template doesn't introduce duplicate
jobs.

Expand the list of Auto-DevOps templates explicitly. Since GitLab has
moved away from a single Auto-DevOps template and towards features
requiring explicit opt-in by including templates, it is unlikely that
new features will be added to Auto-DevOps in future and so keeping a
static list of templates is appropriate.

feat(auto-devops): remove mandatory jobs from auto-devops template

Closes #139

See merge request !178