feat(kurtosis-devner): guard concurrent writes to build output buffer #17442
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The stdout and stderr scanner goroutines were writing to a shared bytes.Buffer concurrently, which is not safe and can cause data races and corrupt output. This change introduces a shared mutex and locks around WriteString calls from both goroutines to serialize writes at line granularity. This ensures deterministic, non-corrupted output accumulation without altering log interleaving semantics.