[ci] Add sizebot to gh actions

[poteto]

Stack from ghstack (oldest at bottom):

• [circleci] Inline scrape_warning_messages #30388
• [ci] Remove sizebot from circleci #30387
• -> [ci] Add sizebot to gh actions #30380
• [ci] Add script to download artifact from github #30376
• [ci] Use yargs to parse args to download-experimental-build #30375
• [ci] Fork scripts/release/download-experimental-build.js #30374
• [ci] Rename temporary build parts #30385

Wires up sizebot in gh actions. I also fixed sizebot incorrectly
reporting that ReactAllWarnings was deleted.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
react-compiler-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 18, 2024 7:56pm

[react-sizebot]

Comparing: 512b09b...ee01e7c

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	=	499.44 kB	499.44 kB	=	89.59 kB	89.59 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	=	504.26 kB	504.26 kB	=	90.30 kB	90.30 kB
facebook-www/ReactDOM-prod.classic.js	=	599.20 kB	599.20 kB	=	105.79 kB	105.79 kB
facebook-www/ReactDOM-prod.modern.js	=	573.37 kB	573.37 kB	=	101.68 kB	101.68 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against b726d15