Turbopack: don't generate CSS for Node.js

[mischnic]

1. Make the SSR asset context a FullContextTransition to not inherit the RSC transitions
2. Insert proper CSS client reference marker modules: for regular CSS, immediately. for CSS Modules, for the referenced real CSS (and not for the JS part)
3. A consequence of 2.: RSC doesn't chunk CSS client references anymore, because they are ChunkingType::Isolated
4. Add module rules to SSR to ignore CSS references (similar to 2.)

Memory usage went slightly down: 38.96gb -> 38.23gb
CPU time went down: 784.97s -> 747.57s
There are 200.000 fewer emit asset calls (so 20%).

[mischnic]

• Turbopack: don't generate CSS for Node.js #75117 👈 (View in Graphite)
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Tests Passed

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Stats from current PR

Default Build

General

	vercel/next.js canary	vercel/next.js mischnic/no-ssr-css	Change
buildDuration	18.4s	19.7s	⚠️ +1.3s
buildDurationCached	15.3s	12.9s	N/A
nodeModulesSize	418 MB	418 MB	N/A
nextStartRea..uration (ms)	421ms	427ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	vercel/next.js mischnic/no-ssr-css	Change
5306-HASH.js gzip	54 kB	54 kB	N/A
8276.HASH.js gzip	169 B	168 B	N/A
8377-HASH.js gzip	5.46 kB	5.46 kB	N/A
bccd1874-HASH.js gzip	52.9 kB	52.9 kB	✓
framework-HASH.js gzip	57.5 kB	57.5 kB	N/A
main-app-HASH.js gzip	241 B	242 B	N/A
main-HASH.js gzip	34.6 kB	34.4 kB	N/A
webpack-HASH.js gzip	1.71 kB	1.71 kB	N/A
Overall change	52.9 kB	52.9 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js mischnic/no-ssr-css	Change
polyfills-HASH.js gzip	39.4 kB	39.4 kB	✓
Overall change	39.4 kB	39.4 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js mischnic/no-ssr-css	Change
_app-HASH.js gzip	193 B	193 B	✓
_error-HASH.js gzip	193 B	193 B	✓
amp-HASH.js gzip	512 B	510 B	N/A
css-HASH.js gzip	343 B	342 B	N/A
dynamic-HASH.js gzip	1.84 kB	1.84 kB	✓
edge-ssr-HASH.js gzip	265 B	265 B	✓
head-HASH.js gzip	363 B	362 B	N/A
hooks-HASH.js gzip	393 B	392 B	N/A
image-HASH.js gzip	4.59 kB	4.58 kB	N/A
index-HASH.js gzip	268 B	268 B	✓
link-HASH.js gzip	2.35 kB	2.35 kB	N/A
routerDirect..HASH.js gzip	328 B	328 B	✓
script-HASH.js gzip	397 B	397 B	✓
withRouter-HASH.js gzip	323 B	326 B	N/A
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Overall change	3.59 kB	3.59 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js mischnic/no-ssr-css	Change
_buildManifest.js gzip	748 B	747 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js mischnic/no-ssr-css	Change
index.html gzip	524 B	523 B	N/A
link.html gzip	540 B	538 B	N/A
withRouter.html gzip	520 B	520 B	✓
Overall change	520 B	520 B	✓

Edge SSR bundle Size

	vercel/next.js canary	vercel/next.js mischnic/no-ssr-css	Change
edge-ssr.js gzip	129 kB	129 kB	N/A
page.js gzip	208 kB	208 kB	N/A
Overall change	0 B	0 B	✓

Middleware size

	vercel/next.js canary	vercel/next.js mischnic/no-ssr-css	Change
middleware-b..fest.js gzip	670 B	665 B	N/A
middleware-r..fest.js gzip	155 B	156 B	N/A
middleware.js gzip	31.3 kB	31.3 kB	N/A
edge-runtime..pack.js gzip	844 B	844 B	✓
Overall change	844 B	844 B	✓

Next Runtimes

	vercel/next.js canary	vercel/next.js mischnic/no-ssr-css	Change
274-experime...dev.js gzip	322 B	322 B	✓
274.runtime.dev.js gzip	314 B	314 B	✓
app-page-exp...dev.js gzip	375 kB	375 kB	N/A
app-page-exp..prod.js gzip	130 kB	130 kB	N/A
app-page-tur..prod.js gzip	143 kB	143 kB	N/A
app-page-tur..prod.js gzip	139 kB	139 kB	N/A
app-page.run...dev.js gzip	363 kB	363 kB	N/A
app-page.run..prod.js gzip	126 kB	126 kB	N/A
app-route-ex...dev.js gzip	37.6 kB	37.6 kB	✓
app-route-ex..prod.js gzip	25.6 kB	25.6 kB	✓
app-route-tu..prod.js gzip	25.6 kB	25.6 kB	✓
app-route-tu..prod.js gzip	25.4 kB	25.4 kB	✓
app-route.ru...dev.js gzip	39.2 kB	39.2 kB	✓
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	21.9 kB	21.9 kB	✓
pages.runtim...dev.js gzip	27.7 kB	27.7 kB	✓
pages.runtim..prod.js gzip	21.9 kB	21.9 kB	✓
server.runti..prod.js gzip	916 kB	916 kB	N/A
Overall change	282 kB	282 kB	✓

build cache

	vercel/next.js canary	vercel/next.js mischnic/no-ssr-css	Change
0.pack gzip	2.1 MB	2.1 MB	N/A
index.pack gzip	74.4 kB	74.4 kB	N/A
Overall change	0 B	0 B	✓

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Commit: a31cfb6

[mischnic]

I've unstacked this from #75139, because I ended up simplifying CSS client references (by handling the CSS Modules differently)