chore(json-schema-to-zod): remove postesm and postcjs

[gigamaax]

haivng a nested package.json causes issues with vitest resolving the correct files. the root level package.json already uses the module, main, and export fields.

Summary

when using vitest, it would throw an error saying the package couldn't be resolved.

I was able to track this down to the nested package.json inside the esm and cjs folders. remove those allowed vitest to resolve properly.

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Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[CLAassistant]

All committers have signed the CLA.

[Joffcom]

Hey @gigamaax,

Thanks for the PR, We have created "GHC-976" as the internal reference to get this reviewed.

One of us will be in touch if there are any changes needed, in most cases this is normally within a couple of weeks but it depends on the current workload of the team.