[ci] Read node version from .nvmrc instead of hardcoding

[poteto]

Stack from ghstack (oldest at bottom):

• [ci] Fix incorrect polling #30531
• -> [ci] Read node version from .nvmrc instead of hardcoding #30530
• [ci] Make some workflows dispatchable #30529

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
react-compiler-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 30, 2024 3:46pm

[react-sizebot]

Comparing: 927ba57...51069a0

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	1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	501.29 kB	501.29 kB	=	89.95 kB	89.95 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	=	508.41 kB	508.41 kB	=	91.12 kB	91.12 kB
facebook-www/ReactDOM-prod.classic.js	=	596.31 kB	596.31 kB	=	105.76 kB	105.76 kB
facebook-www/ReactDOM-prod.modern.js	=	572.61 kB	572.61 kB	=	101.96 kB	101.96 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against 4bedcfa