[flow] Upgrade Flow to 0.245.2

[SamChou19815]

Summary

This PR bumps Flow all the way to the latest 0.245.2.

Most of the suppressions comes from Flow v0.239.0's change to include undefined in the return of Array.pop.

I also enabled react.custom_jsx_typing=true and added custom jsx typing to match the old behavior that React.createElement is effectively any typed. This is necessary since various builtin components like React.Fragment is actually symbol in the React repo instead of React.AbstractComponent<...>. It can be made more accurate by customizing the React$CustomJSXFactory type, but I will leave it to the React team to decide.

How did you test this change?

yarn flow for all the renderers

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
react-compiler-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 8, 2024 10:30pm

[react-sizebot]

Comparing: a8fc4b1...598c945

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	=	505.22 kB	505.22 kB	=	90.29 kB	90.29 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	=	512.41 kB	512.41 kB	=	91.50 kB	91.50 kB
facebook-www/ReactDOM-prod.classic.js	=	600.74 kB	600.74 kB	=	106.27 kB	106.27 kB
facebook-www/ReactDOM-prod.modern.js	=	577.03 kB	577.03 kB	=	102.41 kB	102.41 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against 6d0a55e

[kassens]

Thank you