Remove CacheNode.status field

[acdlite]

I'm about to make some changes to the CacheNode data structure, and before I add more complexity, I noticed an opportunity to remove some — the status field isn't logically necessary:

• The DATA_FETCH and LAZY_INITIALIZED states are already treated as equivalent; in either case, they will cause the render to suspend during render, trigger a lazy data fetch (if one hasn't been triggered already), and then update the router with the result of the response.
• subTreeData is null if and only if the node is in the DATA_FETCH or LAZY_INITIALIZED states, and it always causes the render to suspend. So rather than check if the status is one of those, we can check if subTreeData is null.

The most important changes are to CacheNode type in app-router-context.shared-runtime and the lazy fetching logic in LayoutRouter. Everything else in the diff is related to deleting the status field wherever a CacheNode is referenced, like in the reducer unit tests.

Closes NEXT-1842

[ijjk]

Tests Passed

[ijjk]

Stats from current PR

Default Build

General

	vercel/next.js canary	acdlite/next.js remove-cachenode-status-field	Change
buildDuration	10.9s	10.8s	N/A
buildDurationCached	6.1s	6.1s	N/A
nodeModulesSize	200 MB	200 MB	N/A
nextStartRea..uration (ms)	423ms	429ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	acdlite/next.js remove-cachenode-status-field	Change
170-HASH.js gzip	26.9 kB	26.7 kB	N/A
199.HASH.js gzip	181 B	185 B	N/A
3f784ff6-HASH.js gzip	53.3 kB	53.3 kB	✓
framework-HASH.js gzip	45.2 kB	45.2 kB	✓
main-app-HASH.js gzip	240 B	241 B	N/A
main-HASH.js gzip	31.8 kB	31.6 kB	N/A
webpack-HASH.js gzip	1.7 kB	1.7 kB	N/A
Overall change	98.5 kB	98.5 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	acdlite/next.js remove-cachenode-status-field	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	acdlite/next.js remove-cachenode-status-field	Change
_app-HASH.js gzip	195 B	194 B	N/A
_error-HASH.js gzip	183 B	182 B	N/A
amp-HASH.js gzip	501 B	501 B	✓
css-HASH.js gzip	321 B	321 B	✓
dynamic-HASH.js gzip	2.5 kB	2.5 kB	N/A
edge-ssr-HASH.js gzip	255 B	255 B	✓
head-HASH.js gzip	349 B	350 B	N/A
hooks-HASH.js gzip	368 B	369 B	N/A
image-HASH.js gzip	4.27 kB	4.27 kB	N/A
index-HASH.js gzip	255 B	256 B	N/A
link-HASH.js gzip	2.61 kB	2.6 kB	N/A
routerDirect..HASH.js gzip	311 B	309 B	N/A
script-HASH.js gzip	384 B	384 B	✓
withRouter-HASH.js gzip	307 B	306 B	N/A
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Overall change	1.57 kB	1.57 kB	✓

Client Build Manifests

	vercel/next.js canary	acdlite/next.js remove-cachenode-status-field	Change
_buildManifest.js gzip	484 B	482 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	acdlite/next.js remove-cachenode-status-field	Change
index.html gzip	529 B	527 B	N/A
link.html gzip	541 B	540 B	N/A
withRouter.html gzip	524 B	523 B	N/A
Overall change	0 B	0 B	✓

Edge SSR bundle Size

	vercel/next.js canary	acdlite/next.js remove-cachenode-status-field	Change
edge-ssr.js gzip	93.8 kB	93.7 kB	N/A
page.js gzip	146 kB	146 kB	N/A
Overall change	0 B	0 B	✓

Middleware size

	vercel/next.js canary	acdlite/next.js remove-cachenode-status-field	Change
middleware-b..fest.js gzip	628 B	621 B	N/A
middleware-r..fest.js gzip	151 B	151 B	✓
middleware.js gzip	37.4 kB	37.4 kB	N/A
edge-runtime..pack.js gzip	1.92 kB	1.92 kB	✓
Overall change	2.07 kB	2.07 kB	✓

Next Runtimes

	vercel/next.js canary	acdlite/next.js remove-cachenode-status-field	Change
app-page-exp...dev.js gzip	168 kB	168 kB	N/A
app-page-exp..prod.js gzip	94 kB	93.9 kB	N/A
app-page-tur..prod.js gzip	94.7 kB	94.7 kB	N/A
app-page-tur..prod.js gzip	89.3 kB	89.2 kB	N/A
app-page.run...dev.js gzip	138 kB	138 kB	N/A
app-page.run..prod.js gzip	88.6 kB	88.5 kB	N/A
app-route-ex...dev.js gzip	24 kB	23.9 kB	N/A
app-route-ex..prod.js gzip	16.7 kB	16.6 kB	N/A
app-route-tu..prod.js gzip	16.7 kB	16.6 kB	N/A
app-route-tu..prod.js gzip	16.3 kB	16.2 kB	N/A
app-route.ru...dev.js gzip	23.4 kB	23.4 kB	N/A
app-route.ru..prod.js gzip	16.3 kB	16.2 kB	N/A
pages-api-tu..prod.js gzip	9.37 kB	9.37 kB	✓
pages-api.ru...dev.js gzip	9.64 kB	9.64 kB	✓
pages-api.ru..prod.js gzip	9.37 kB	9.37 kB	✓
pages-turbo...prod.js gzip	22 kB	21.9 kB	N/A
pages.runtim...dev.js gzip	22.6 kB	22.5 kB	N/A
pages.runtim..prod.js gzip	21.9 kB	21.9 kB	N/A
server.runti..prod.js gzip	49.4 kB	49.4 kB	✓
Overall change	77.8 kB	77.8 kB	✓

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Commit: f4206e8