Backport of scheduler: appropriately unblock evals with quotas into release/1.4.x #18853
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Backport
This PR is auto-generated from #18838 to be assessed for backporting due to the inclusion of the label backport/1.4.x.
The below text is copied from the body of the original PR.
Fixes #17278
When an eval is blocked due to e.g. cpu exhausted on nodes, but there happens to also be a quota on the job's namespace, the eval would not get auto-unblocked when the node cpu got freed up.
This change ensures, when considering quota during BlockedEvals.unblock(), that the block was due to quota in the first place, so unblocking does not get skipped due to the mere existence of a quota on the namespace.
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