chore: declare __dirname for Node.js ES modules

[chenjiahan]

Summary

Declare __dirname for Node.js ES modules as Rslib no longer inject the __dirname shim by default.

Related Links

web-infra-dev/rslib#291
https://stackoverflow.com/questions/46745014/alternative-for-dirname-in-node-js-when-using-es6-modules
close #3777

Checklist

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

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