Keep fouc tags for streaming

[huozhi]

Basically the revert change of #31187

The fouc tag are rendered in first place, and the removing fouc tags script is executed before hydration which is early enough. This will unblock the dev mode of global CSS development

Bug

• Related issues linked using fixes #number
• Integration tests added
• Errors have helpful link attached, see contributing.md

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General Overall decrease ✓

	vercel/next.js canary	huozhi/next.js fix-styling-fouc	Change
buildDuration	18.3s	17.9s	-379ms
buildDurationCached	7.2s	7.2s	⚠️ +87ms
nodeModulesSize	456 MB	456 MB	-182 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	huozhi/next.js fix-styling-fouc	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.692	3.643	-0.05
/ avg req/sec	677.21	686.22	+9.01
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.572	1.571	0
/error-in-render avg req/sec	1590.2	1591.28	+1.08

Client Bundles (main, webpack)

	vercel/next.js canary	huozhi/next.js fix-styling-fouc	Change
925.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42 kB	42 kB	✓
main-HASH.js gzip	28 kB	28 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	71.6 kB	71.6 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	huozhi/next.js fix-styling-fouc	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	huozhi/next.js fix-styling-fouc	Change
_app-HASH.js gzip	1.36 kB	1.36 kB	✓
_error-HASH.js gzip	192 B	192 B	✓
amp-HASH.js gzip	309 B	309 B	✓
css-HASH.js gzip	327 B	327 B	✓
dynamic-HASH.js gzip	2.57 kB	2.57 kB	✓
head-HASH.js gzip	351 B	351 B	✓
hooks-HASH.js gzip	920 B	920 B	✓
image-HASH.js gzip	5.48 kB	5.48 kB	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	2.26 kB	2.26 kB	✓
routerDirect..HASH.js gzip	320 B	320 B	✓
script-HASH.js gzip	387 B	387 B	✓
withRouter-HASH.js gzip	319 B	319 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	15.2 kB	15.2 kB	✓

Client Build Manifests

	vercel/next.js canary	huozhi/next.js fix-styling-fouc	Change
_buildManifest.js gzip	460 B	460 B	✓
Overall change	460 B	460 B	✓

Rendered Page Sizes

	vercel/next.js canary	huozhi/next.js fix-styling-fouc	Change
index.html gzip	531 B	531 B	✓
link.html gzip	545 B	545 B	✓
withRouter.html gzip	525 B	525 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Default Build with SWC (Decrease detected ✓)

General Overall decrease ✓

	vercel/next.js canary	huozhi/next.js fix-styling-fouc	Change
buildDuration	21.6s	21.7s	⚠️ +100ms
buildDurationCached	7.2s	7.1s	-75ms
nodeModulesSize	456 MB	456 MB	-182 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	huozhi/next.js fix-styling-fouc	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.648	3.681	⚠️ +0.03
/ avg req/sec	685.33	679.23	⚠️ -6.1
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.547	1.603	⚠️ +0.06
/error-in-render avg req/sec	1615.96	1559.98	⚠️ -55.98

Client Bundles (main, webpack)

	vercel/next.js canary	huozhi/next.js fix-styling-fouc	Change
925.HASH.js gzip	178 B	178 B	✓
framework-HASH.js gzip	42.3 kB	42.3 kB	✓
main-HASH.js gzip	28.2 kB	28.2 kB	✓
webpack-HASH.js gzip	1.45 kB	1.45 kB	✓
Overall change	72.1 kB	72.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	huozhi/next.js fix-styling-fouc	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	huozhi/next.js fix-styling-fouc	Change
_app-HASH.js gzip	1.35 kB	1.35 kB	✓
_error-HASH.js gzip	179 B	179 B	✓
amp-HASH.js gzip	313 B	313 B	✓
css-HASH.js gzip	324 B	324 B	✓
dynamic-HASH.js gzip	2.56 kB	2.56 kB	✓
head-HASH.js gzip	351 B	351 B	✓
hooks-HASH.js gzip	921 B	921 B	✓
image-HASH.js gzip	5.59 kB	5.59 kB	✓
index-HASH.js gzip	261 B	261 B	✓
link-HASH.js gzip	2.33 kB	2.33 kB	✓
routerDirect..HASH.js gzip	322 B	322 B	✓
script-HASH.js gzip	388 B	388 B	✓
withRouter-HASH.js gzip	317 B	317 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	15.3 kB	15.3 kB	✓

Client Build Manifests

	vercel/next.js canary	huozhi/next.js fix-styling-fouc	Change
_buildManifest.js gzip	458 B	458 B	✓
Overall change	458 B	458 B	✓

Rendered Page Sizes

	vercel/next.js canary	huozhi/next.js fix-styling-fouc	Change
index.html gzip	531 B	531 B	✓
link.html gzip	546 B	546 B	✓
withRouter.html gzip	527 B	527 B	✓
Overall change	1.6 kB	1.6 kB	✓

Commit: b9b685e