fix: do not copy public dir for node target by default

[9aoy]

Summary

Do not copy public dir for node target by default. Update publicDir.copyOnBuild default value from true to target !== 'node' as publicDir is not normally used for node target .

Note 🔴 : This modification may cause breaking changes for some users who use publicDir in node target.

Checklist

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

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