fix: let jiti load @rspack/core with native require

[chenjiahan]

Summary

Add @rspack/core to jiti's nativeModules options. This allows jiti load @rspack/core with native require() and avoids @rspack/core being loaded twice.

This PR should fixes the "The 'compilation' argument must be an instance of Compilation error" error after upgrade to v1.3.0.

Related Links

• https://github.com/unjs/jiti?tab=readme-ov-file#nativemodules
• [Bug]: "The 'compilation' argument must be an instance of Compilation error" after upgrade to v1.3.0 rspack#9841
• feat: support module subtype in js side rspack#9613

Checklist

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

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