fix(live-preview-vue): update build config to compile as esm

[danielwaltz]

The distributed files for @payloadcms/live-preview-vue are compiled to commonjs instead of ESM, which causes issues in ESM based projects like when using Nuxt.

This PR fixes this issue by updating the built config to be es6, matching what most other packages are using.

Related to #12806

[github-actions]

Pull Request titles must follow the Conventional Commits specification and have valid scopes.

Unknown scope "live-preview-vue" found in pull request title "fix(live-preview-vue): update build config to compile as esm". Scope must match one of: cpa, db-*, db-d1-sqlite, db-mongodb, db-postgres, db-vercel-postgres, db-sqlite, db-d1-sqlite, drizzle, email-*, email-nodemailer, email-resend, eslint, graphql, live-preview, live-preview-react, next, payload-cloud, plugin-cloud, plugin-cloud-storage, plugin-ecommerce, plugin-form-builder, plugin-import-export, plugin-multi-tenant, plugin-nested-docs, plugin-redirects, plugin-search, plugin-sentry, plugin-seo, plugin-stripe, richtext-*, richtext-lexical, richtext-slate, sdk, storage-*, storage-azure, storage-gcs, storage-r2, storage-uploadthing, storage-vercel-blob, storage-s3, translations, ui, templates, examples(/(\w|-)+)?, deps.

feat(ui): add Button component
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[JessRynkar]

Hi @danielwaltz thank you for opening this! Apologies for the delay in getting it reviewed. This change looks good to me, it aligns the package with the rest of the live-preview ecosystem. Once tests run/pass, I will approve 👍

[github-actions]

🚀 This is included in version v3.76.0

[github-actions]

🚀 This is included in version v3.76.0