chore: Build react-dom/test-utils in codesandbox deploy

[eps1lon]

Summary

Build react-dom/test-utils in codesandbox deploy which is useful to verify fixes for issues related to react-dom/test-utils (e.g. #19318).

Test Plan

• Verify that the codesandbox linked in Bug: act warning misleading if an effect wasn't run #19318 is runnable with this build. Edit: works: https://codesandbox.io/s/missing-act-on-every-effect-int7g?file=/package.json

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 048e4ed:

Sandbox	Source
React	Configuration

[sizebot]

No significant bundle size changes to report.

Size changes (experimental)

Generated by 🚫 dangerJS against 048e4ed

[sizebot]

No significant bundle size changes to report.

Size changes (stable)

Generated by 🚫 dangerJS against 048e4ed

[gaearon]

Thanks!