Add group name prefix to job names

Add gitlab-org: prefix to job names.

When creating or changing a new triage policy or triage package:

• [-] Consider adding documentation to the handbook pages for Triage Operations: https://gitlab.com/gitlab-com/www-gitlab-com/blob/master/source/handbook/engineering/quality/triage-operations/index.html.md
• [-] Consider announcing to the appropriate Slack channels or week-in-review

Closes #411 (closed)