refactor(react): update build output to use dist dir

[joshblack]

This moves us closer to our end goal for how we want to bundle up @primer/react 👀. In this PR, we update our rollup config to emit all package files into the dist directory and make the corresponding changes in package.json to point to the new location of things.

In the future, we'll likely have this dist directory only be exporting ESM files.

This change will also make it a little easier for us to start to enable tools like publint as it's a little easier for us to dual emit types for CJS/ESM (if we want to do that before moving to ESM).

Changelog

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Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

Testing & Reviewing

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	104.3 KB (0%)
packages/react/dist/browser.umd.js	104.59 KB (0%)