test(e2e): add way to configure flags from env

[joshblack]

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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
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• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

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[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	97.47 KB (0%)
packages/react/dist/browser.umd.js	97.8 KB (0%)