[ci] Refactor download-build-artifacts

[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

Extracts out the code to download builds from GH into its own module so
that it can be reused later.

[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: 1350a85...589e186

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%	1.83 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	=	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	=	601.27 kB	598.90 kB	=	106.28 kB	105.77 kB
facebook-www/ReactDOM-prod.modern.js	=	577.38 kB	575.01 kB	=	102.52 kB	102.01 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
facebook-www/ReactDOM-profiling.classic.js	=	631.23 kB	628.86 kB	=	110.73 kB	110.24 kB
facebook-www/ReactDOMTesting-prod.classic.js	=	616.01 kB	613.64 kB	=	109.98 kB	109.47 kB
facebook-www/ReactDOM-profiling.modern.js	=	606.70 kB	604.34 kB	=	106.76 kB	106.29 kB
facebook-www/ReactDOM-prod.classic.js	=	601.27 kB	598.90 kB	=	106.28 kB	105.77 kB
facebook-www/ReactDOMTesting-prod.modern.js	=	592.12 kB	589.76 kB	=	106.23 kB	105.73 kB
facebook-www/ReactDOMTesting-dev.classic.js	=	1,106.31 kB	1,101.84 kB	=	186.95 kB	186.23 kB
facebook-www/ReactDOM-prod.modern.js	=	577.38 kB	575.01 kB	=	102.52 kB	102.01 kB
facebook-www/ReactDOM-dev.classic.js	=	1,089.40 kB	1,084.92 kB	=	183.00 kB	182.27 kB
facebook-www/ReactDOMTesting-dev.modern.js	=	1,069.13 kB	1,064.66 kB	=	180.36 kB	179.63 kB
facebook-www/ReactDOM-dev.modern.js	=	1,052.22 kB	1,047.74 kB	=	176.45 kB	175.74 kB
facebook-react-native/react/cjs/React-profiling.js	=	19.08 kB	18.99 kB	=	4.91 kB	4.89 kB
facebook-react-native/react/cjs/React-prod.js	=	18.65 kB	18.56 kB	=	4.83 kB	4.80 kB
facebook-www/ReactReconciler-prod.classic.js	=	461.89 kB	459.18 kB	=	74.68 kB	74.15 kB
facebook-www/ReactReconciler-prod.modern.js	=	442.99 kB	440.29 kB	=	71.87 kB	71.34 kB
facebook-www/ReactReconciler-dev.classic.js	=	741.72 kB	737.01 kB	=	118.39 kB	117.69 kB
facebook-www/ReactART-prod.classic.js	=	370.65 kB	368.28 kB	=	62.82 kB	62.34 kB
facebook-www/ReactReconciler-dev.modern.js	=	716.85 kB	712.14 kB	=	114.27 kB	113.57 kB
facebook-www/ReactART-prod.modern.js	=	353.18 kB	350.81 kB	=	60.09 kB	59.58 kB
facebook-www/ReactART-dev.classic.js	=	659.17 kB	654.69 kB	=	105.76 kB	105.09 kB
facebook-www/ReactART-dev.modern.js	=	635.68 kB	631.21 kB	=	102.06 kB	101.38 kB
facebook-www/React-dev.classic.js	=	74.39 kB	73.80 kB	=	16.27 kB	16.19 kB
facebook-www/React-dev.modern.js	=	73.53 kB	72.94 kB	=	16.13 kB	16.05 kB
facebook-www/React-profiling.classic.js	=	22.92 kB	22.61 kB	=	5.94 kB	5.87 kB
facebook-www/React-profiling.modern.js	=	22.92 kB	22.60 kB	=	5.94 kB	5.87 kB
facebook-www/React-prod.classic.js	=	22.48 kB	22.17 kB	=	5.86 kB	5.79 kB
facebook-www/React-prod.modern.js	=	22.48 kB	22.17 kB	=	5.86 kB	5.79 kB

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