fix: should recognize negative preload value

[JSerFeng]

Summary

webpackPreload and webpackPrefetch magic comments can set preload and prefetch to script tag, the value of these comments determine the priority and the order of preloaded chunks. The value can also be negative, as it is only for ordering.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[netlify]

✅ Deploy Preview for rspack canceled.

Name	Link
🔨 Latest commit	a384f50
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[codspeed-hq]

CodSpeed Performance Report

Merging #8862 will not alter performance

_{Comparing fix/preload-prefetch (a384f50) with main (6f12327)}

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Summary

✅ 3 untouched benchmarks