If the server fails to schedule a run, ensure a good error message is surfaced saying so

[augray]

FWIW, here is a sample of a status condition for a pod that is currently unable to schedule:

status:
  conditions:
  - lastProbeTime: null
    lastTransitionTime: "2022-10-08T02:24:05Z"
    message: '0/3 nodes are available: 1 Insufficient memory, 3 Insufficient nvidia.com/gpu.'
    reason: Unschedulable
    status: "False"
    type: PodScheduled