Update GitLab CI to use GL Templates

Story

As a GitLab user, I would like to run jobs that use GitLab's templates, So that I can be on the hook for fewer job details

Solution

Add new templates to the generators for GitLab. Ideally these would be agnostic to either GDG or GitLab.com.

Tasks

• Dependency scanning
• SAST
• DAST
• Pa11y

Acceptance Criteria

• Generated templates run on GDG.
• Generated templates run on GitLab.com