winch: Generalize with_scratch function
#10997
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* Support any return value, not just `Result<()>` * Use `FnOnce` instead of `FnMut` This meant that many `Ok(())` values could be dropped, but other values using `?` needed to explicitly annotate the return type which is done by returning `anyhow::Ok(())` to force the error type.
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Result<()>FnOnceinstead ofFnMutThis meant that many
Ok(())values could be dropped, but other values using?needed to explicitly annotate the return type which is done by returninganyhow::Ok(())to force the error type.