[ci] Remove jestSequencer

[poteto]

Stack from ghstack (oldest at bottom):

• [ci] Remove references to CIRCLE_NODE_{TOTAL,INDEX} #30501
• -> [ci] Remove jestSequencer #30500
• [ci] Fix ci prep script #30499

This was previously used for circleci parallelization but is no longer
needed.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
react-compiler-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 29, 2024 4:57pm

[react-sizebot]

Comparing: 03072a7...15f51c2

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	=	1.82 kB	1.82 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	+0.05%	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	601.27 kB	=	106.28 kB	106.28 kB
facebook-www/ReactDOM-prod.modern.js	=	577.38 kB	577.38 kB	=	102.52 kB	102.52 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against 1e829bc