fix: skip non-resource link tags in SRI plugin

[chenjiahan]

Summary

Updated getTagSrc() to only process <link> tags that actually load resources requiring SRI:

• Process: stylesheet, modulepreload, preload (script/style only)
• Skip: dns-prefetch, preconnect, prefetch, icon, etc.

This prevents unnecessary SRI processing on hint/metadata tags and improves plugin accuracy.

Related links

See MDN:

• https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/link#integrity
• resolve [Bug]: throw error when use performance.dnsPrefetch and security.sri together rsbuild#5445
• Interoperability with resource hints waysact/webpack-subresource-integrity#179
• Avoid calculating integrity for preconnect tag waysact/webpack-subresource-integrity#238

Checklist

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

[netlify]

✅ Deploy Preview for rspack canceled.

Name	Link
🔨 Latest commit	dccfcd3
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[codspeed-hq]

CodSpeed Performance Report

Merging #10829 will not alter performance

_{Comparing sri_skip_0629 (dccfcd3) with main (ce4eb8f)}

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Summary

✅ 16 untouched benchmarks