Add kas `gitlab_deployment_health` metric to be tested for promotion
What does this MR do and why?
Part of gitlab-com/gl-infra/delivery#2576 (closed)
Now that KAS has a gitlab_deployment_health
metric that accurately
encompasses error rate and apdex, we want to make our promotion
checks include kas in determining if things are safe to promote.
Note that kas isn't auto-deployed yet, however it should be safe to start considering its health for promotion, with the work to make it auto-deployed coming later.
Author Check-list
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Has documentation been updated?