fix(create-rspack): ignore rspack profile and remove npmignore file

[chenjiahan]

Summary

• Updates the .gitignore file to add patterns to ignore Rspack profile directories (.rspack-profile-*).
• Remove the useless .npmignore files.

Related Links

• https://rsbuild.rs/guide/debug/build-profiling#rspack-profiling

Checklist

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

[netlify]

✅ Deploy Preview for rspack canceled.

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🔨 Latest commit	d358c05
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[codspeed-hq]

CodSpeed Performance Report

Merging #10616 will not alter performance

_{Comparing create_rspack_ignore_0610 (d358c05) with main (fecdb6c)}

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Summary

✅ 12 untouched benchmarks