The Pending GPU pods counter on gpu-quotas joined raw
kube_pod_container_resource_requests (per-container series) against
kube_pod_status_phase (per-pod series). Multi-container pods were
counted once per requesting container instead of once per pod, so the
widget over-reported whenever a Pending pod had more than one GPU
container. Collapse the requests to pod level before the join.
Signed-off-by: Arsolitt <arsolitt@gmail.com>