Add Kubernetes canary template
Replaces https://gitlab.com/gitlab-org/gitlab-ci-yml/merge_requests/68 by putting canary deploy into new template so users choose whether they want canaries or not. Also updated to use SLUG instead of NAME.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Replaces https://gitlab.com/gitlab-org/gitlab-ci-yml/merge_requests/68 by putting canary deploy into new template so users choose whether they want canaries or not. Also updated to use SLUG instead of NAME.