[metadata] Change the array head to single node in flight data

[huozhi]

What

Now we can change the HeadData back to ReactNode as the metadata is separated from it, and rendered in the body along with page component. The array type of HeadData was a temporary state where we renders head as array to separate the viewport and metadata. Now since they're fully separated we can keep the Head simple with viewport data only.

This PR is stacked on #74262.

[huozhi]

• [metadata] add option of configuring ua of async metadata #74594
• [metadata] Change the array head to single node in flight data #74299 👈 (View in Graphite)
• [metadata] Move metadata rendering adjacent to page component #74262
• canary

This stack of pull requests is managed by Graphite. Learn more about stacking.

[ijjk]

Tests Passed

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General

	vercel/next.js canary	vercel/next.js 12-25-replace_array_head_to_react_node	Change
buildDuration	22.7s	20.8s	N/A
buildDurationCached	20s	17.7s	N/A
nodeModulesSize	417 MB	417 MB	N/A
nextStartRea..uration (ms)	533ms	530ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	vercel/next.js 12-25-replace_array_head_to_react_node	Change
1187-HASH.js gzip	52.6 kB	52.5 kB	N/A
8276.HASH.js gzip	169 B	168 B	N/A
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main-HASH.js gzip	34.1 kB	34.1 kB	N/A
webpack-HASH.js gzip	1.71 kB	1.71 kB	N/A
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Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js 12-25-replace_array_head_to_react_node	Change
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Client Pages

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	vercel/next.js canary	vercel/next.js 12-25-replace_array_head_to_react_node	Change
_buildManifest.js gzip	749 B	747 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js 12-25-replace_array_head_to_react_node	Change
index.html gzip	524 B	522 B	N/A
link.html gzip	539 B	536 B	N/A
withRouter.html gzip	520 B	519 B	N/A
Overall change	0 B	0 B	✓

Edge SSR bundle Size

	vercel/next.js canary	vercel/next.js 12-25-replace_array_head_to_react_node	Change
edge-ssr.js gzip	128 kB	128 kB	N/A
page.js gzip	206 kB	206 kB	N/A
Overall change	0 B	0 B	✓

Middleware size

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middleware-b..fest.js gzip	672 B	667 B	N/A
middleware-r..fest.js gzip	155 B	156 B	N/A
middleware.js gzip	31.2 kB	31.2 kB	N/A
edge-runtime..pack.js gzip	844 B	844 B	✓
Overall change	844 B	844 B	✓

Next Runtimes

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274-experime...dev.js gzip	322 B	322 B	✓
274.runtime.dev.js gzip	314 B	314 B	✓
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app-page-tur..prod.js gzip	142 kB	142 kB	N/A
app-page-tur..prod.js gzip	138 kB	138 kB	N/A
app-page.run...dev.js gzip	352 kB	352 kB	N/A
app-page.run..prod.js gzip	125 kB	125 kB	N/A
app-route-ex...dev.js gzip	37.5 kB	37.5 kB	✓
app-route-ex..prod.js gzip	25.5 kB	25.5 kB	✓
app-route-tu..prod.js gzip	25.5 kB	25.5 kB	✓
app-route-tu..prod.js gzip	25.4 kB	25.4 kB	✓
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app-route.ru..prod.js gzip	25.4 kB	25.4 kB	✓
pages-api-tu..prod.js gzip	9.69 kB	9.69 kB	✓
pages-api.ru...dev.js gzip	11.6 kB	11.6 kB	✓
pages-api.ru..prod.js gzip	9.68 kB	9.68 kB	✓
pages-turbo...prod.js gzip	21.7 kB	21.7 kB	✓
pages.runtim...dev.js gzip	27.5 kB	27.5 kB	✓
pages.runtim..prod.js gzip	21.7 kB	21.7 kB	✓
server.runti..prod.js gzip	916 kB	916 kB	✓
Overall change	1.2 MB	1.2 MB	✓

build cache Overall increase ⚠️

	vercel/next.js canary	vercel/next.js 12-25-replace_array_head_to_react_node	Change
0.pack gzip	2.08 MB	2.08 MB	⚠️ +124 B
index.pack gzip	74.6 kB	74.1 kB	N/A
Overall change	2.08 MB	2.08 MB	⚠️ +124 B

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Commit: 1e9ca24