perf: reuse raw_content in FileProgressStore::save #24701
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Previously FileProgressStore::save was reading the same file twice: once into raw_content to check for emptiness and then again inside serde_json::from_slice. This added an extra system call, allocation and parse input without changing the observable behavior.
This change reuses the already read raw_content buffer when deserializing the existing JSON state. The logic for handling missing, empty or invalid files remains the same, but we avoid redundant work on every save call.