[ci] Update prepare-release-from-ci to dl from GH

[poteto]

Stack from ghstack (oldest at bottom):

• [ci] Cleanup forked files #30481
• -> [ci] Update prepare-release-from-ci to dl from GH #30485
• [ci] Refactor download-build-artifacts #30484

Updates this script to download from GH actions instead, to prepare for
moving the cron jobs over to GH actions.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
react-compiler-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 26, 2024 5:21pm

[react-sizebot]

Comparing: f7ee804...81a9076

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	+0.11%	1.82 kB	1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	501.46 kB	501.46 kB	=	89.98 kB	89.98 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	+0.11%	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	506.28 kB	506.28 kB	=	90.68 kB	90.68 kB
facebook-www/ReactDOM-prod.classic.js	=	598.90 kB	598.90 kB	=	105.77 kB	105.77 kB
facebook-www/ReactDOM-prod.modern.js	=	575.01 kB	575.01 kB	=	102.01 kB	102.01 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against 8c0ad4d