Ensure react-dom/client is built in Codesandbox preview builds

[eps1lon]

Summary

react-dom/client wasn't usable in Codesandbox preview builds because we never built it. This used to work because the client APIs used to be exported from react-dom/index but now aren't so we need to explicitly list the entrypoint.

How did you test this change?

• Codesandbox for this branch works: https://codesandbox.io/p/sandbox/fixed-react-preview-build-in-csb-t2t9gh?file=%2Fpackage.json

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
react-compiler-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 20, 2024 8:00pm

[react-sizebot]

Comparing: 92d26c8...36dd945

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.68 kB	6.68 kB	+0.05%	1.82 kB	1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	500.37 kB	500.37 kB	=	89.80 kB	89.80 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	+0.05%	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	507.50 kB	507.50 kB	=	90.96 kB	90.96 kB
facebook-www/ReactDOM-prod.classic.js	=	595.24 kB	595.24 kB	=	105.55 kB	105.55 kB
facebook-www/ReactDOM-prod.modern.js	=	571.54 kB	571.54 kB	=	101.75 kB	101.75 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against 3aee977