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Wire BackendReplicas through to StatefulSet replica count (#4291)

feat(runner): wire BackendReplicas through to StatefulSet replica count (RC-11)

Threads RunConfig.BackendReplicas (*int32) from the runner through
runtime.Setup and DeployWorkloadOptions to the Kubernetes StatefulSet
apply configuration. When BackendReplicas is nil the replicas field is
omitted from the server-side apply spec, preserving HPA/kubectl control;
when set, the specified count is applied.

Closes #4209

Co-authored-by: taskbot <taskbot@users.noreply.github.com>

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