[DoNotCommit] Turn on enableFabricCompleteRootInCommitPhase for OSS

[cipolleschi]

Summary

In OSS and in React Native, startTransition is behaving oddly, not yielding properly. We believe the the enableFabricCompleteRootInCommitPhase flag might fix this behavior.

This PR turns on the flag only for OSS to let CI build the artifacts we need to test this hypothesis

How did you test this change?

CI

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
react-compiler-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 2, 2024 4:33pm

[react-sizebot]

Comparing: 4f604941569d2e8947ce1460a0b2997e835f37b9...6f82da8a3d2f65002f07e2af79802a05c7d36a94

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	=	1.83 kB	1.82 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	501.40 kB	501.40 kB	=	89.99 kB	89.99 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	=	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	508.52 kB	508.52 kB	=	91.16 kB	91.16 kB
facebook-www/ReactDOM-prod.classic.js	=	596.16 kB	596.16 kB	=	105.70 kB	105.69 kB
facebook-www/ReactDOM-prod.modern.js	=	572.44 kB	572.44 kB	=	101.88 kB	101.88 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by :no_entry_sign: dangerJS against 0b2ccdd7351d61c6f31074c85f2bd94e69be9076

[github-actions[bot]]

This pull request has been automatically marked as stale. If this pull request is still relevant, please leave any comment (for example, "bump"), and we'll keep it open. We are sorry that we haven't been able to prioritize reviewing it yet. Your contribution is very much appreciated.