test: run partial cases concurrently

[LingyuCoder]

Summary

Run builtin, cache, diagnostic, normal test cases concurrently

Checklist

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

[netlify]

✅ Deploy Preview for rspack canceled.

Name	Link
🔨 Latest commit	c1eac25
🔍 Latest deploy log	https://app.netlify.com/sites/rspack/deploys/67c6d0c12554cc00087f4999

[codspeed-hq]

CodSpeed Performance Report

Merging #9547 will not alter performance

_{Comparing test/concurrent-partial (c1eac25) with main (c8bcb8f)}

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Summary

✅ 7 untouched benchmarks