chore: remove pug-related chain IDs as they are unused

[chenjiahan]

Summary

Remove pug-related chain IDs as they are unused.

Related Links

• https://github.com/rspack-contrib/rsbuild-plugin-pug/blob/main/src/index.ts

Checklist

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

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[Copilot]

Pull Request Overview

This PR removes unused pug-related chain IDs from the configuration file to clean up the codebase by eliminating dead code.

• Removes two PUG chain ID constants that are no longer needed
• Cleans up associated comments for the removed constants

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