[Serve] Set num_cpus to 0 in run_graph() task
#26177
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Why are these changes needed?
The Serve REST API launches an intermediate Ray task when running a deployment graph. #25861 revealed that this task currently consumes CPUs, reducing the available resources on the Ray cluster without notifying the user. This change sets the task's
num_cpusto 0, similar to theServeControlleractor.Related issue number
N/A
Checks
scripts/format.shto lint the changes in this PR.test_run_graph_task_uses_zero_cpustotest_standalone.py.