When a workflow job failed, the API response reported all steps as
failed — even steps that had completed successfully before the failing
step. `ToActionWorkflowJob` was calling `ToActionsStatus(job.Status)`
for every step instead of `ToActionsStatus(step.Status)`, so the job's
overall conclusion was propagated to each step.
Each `ActionTaskStep` has its own `Status` field that tracks the actual
outcome of that step independently of the job result.
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Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
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