[react] Rename unstable_expectedLoadTime to defer in Suspense

[eps1lon]

Types for facebook/react#35022

[typescript-bot]

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• react — on npm, on unpkg (author is owner)

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---

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[typescript-bot]

🔔 @johnnyreilly @bbenezech @pzavolinsky @ericanderson @DovydasNavickas @theruther4d @guilhermehubner @ferdaber @jrakotoharisoa @pascaloliv @Hotell @franklixuefei @Jessidhia @saranshkataria @lukyth @zieka @dancerphil @dimitropoulos @disjukr @vhfmag @priyanshurav @Semigradsky @mattpocock — please review this PR in the next few days. Be sure to explicitly select Approve or Request Changes in the GitHub UI so I know what's going on.