refactor createInfinitePromise to be re-used unresolveable thenable

[ztanner]

We currently use an infinite promise to indefinitely suspend while waiting for something else to happen (new data from a server response, or an MPA navigation finally resolving).

We don't need to create a new promise every time we do this, and instead can leverage a shared "thenable" that will never actually resolve. The primary motivation for this is that use shouldn't be called with a new promise value between renders as described in the RFC.

Closes NEXT-2625

[ztanner]

• refactor createInfinitePromise to be re-used unresolveable thenable #62595 👈
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General

	vercel/next.js canary	vercel/next.js 02-27-refactor_createInfinitePromise_to_be_re-used_unresolveable_thenable	Change
buildDuration	13.8s	13.8s	N/A
buildDurationCached	7.5s	6.3s	N/A
nodeModulesSize	197 MB	197 MB	N/A
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Client Bundles (main, webpack)

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Rendered Page Sizes

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index.html gzip	528 B	526 B	N/A
link.html gzip	541 B	539 B	N/A
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Edge SSR bundle Size

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edge-ssr.js gzip	95 kB	95 kB	N/A
page.js gzip	3.06 kB	3.06 kB	N/A
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Middleware size

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build cache

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0.pack gzip	1.56 MB	1.56 MB	N/A
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Overall change	0 B	0 B	✓

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Commit: 36bd05d