feat: classify Kueue GPU admission failures with user-facing messages

[nbs-rh]

Related to https://redhat.atlassian.net/browse/RHAIRFE-2171

When a Kueue workload is inadmissible (QuotaReserved=False/Inadmissible), the reconciler now distinguishes GPU quota exhaustion from generic queue errors by inspecting the Job's pod spec and the Kueue condition message.

GPU jobs that can't be admitted get message_code=gpu_unavailable with a human-readable explanation; all other admission failures use queue_error.

This avoids surfacing raw cluster internals through the eval-hub API.

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