refactor: Monitor kube_container_cpu unless container has quota
Relates to gitlab-com/gl-infra/scalability#2724 (comment 1723377089)
By removing containers with a CPU quota set, we remove from capacity planning the containers that operate near 100% CPU capacity that are constantly showing up as a capacity warning, for example https://gitlab.com/gitlab-com/gl-infra/capacity-planning-trackers/gitlab-com/-/issues/1474.
This leaves us with a smaller subset of containers to warn.
