revert changes to process default routes at build

[ztanner]

Reverts changes from #61173 & #60240 (while leaving the tests that were added).

There are too many spots where considering /default routes as pages needs to be carefully considered in different runtimes, and it turns out that it's not actually needed to handle the case that it was originally added for. I confirmed that the test that added the case it was intended to fix (parallel-routes-catchall-default, along with the unit tests in normalize-catchall-routes) are still passing as expected.

[ztanner]

• canary
  • revert changes to process default routes at build #61241 👈

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[ijjk]

Tests Passed

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Stats from current PR

Default Build

General

	vercel/next.js canary	vercel/next.js 01-26-revert_changes_to_process_default_routes_at_build	Change
buildDuration	11.7s	11.6s	N/A
buildDurationCached	6.1s	4.9s	N/A
nodeModulesSize	200 MB	200 MB	N/A
nextStartRea..uration (ms)	427ms	433ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	vercel/next.js 01-26-revert_changes_to_process_default_routes_at_build	Change
3f784ff6-HASH.js gzip	53.4 kB	53.4 kB	✓
423.HASH.js gzip	185 B	181 B	N/A
68-HASH.js gzip	29.8 kB	29.8 kB	N/A
framework-HASH.js gzip	45.2 kB	45.2 kB	✓
main-app-HASH.js gzip	237 B	239 B	N/A
main-HASH.js gzip	31.8 kB	31.8 kB	N/A
webpack-HASH.js gzip	1.7 kB	1.7 kB	✓
Overall change	100 kB	100 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js 01-26-revert_changes_to_process_default_routes_at_build	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js 01-26-revert_changes_to_process_default_routes_at_build	Change
_app-HASH.js gzip	194 B	195 B	N/A
_error-HASH.js gzip	182 B	181 B	N/A
amp-HASH.js gzip	502 B	502 B	✓
css-HASH.js gzip	320 B	322 B	N/A
dynamic-HASH.js gzip	2.5 kB	2.5 kB	N/A
edge-ssr-HASH.js gzip	255 B	256 B	N/A
head-HASH.js gzip	350 B	349 B	N/A
hooks-HASH.js gzip	368 B	369 B	N/A
image-HASH.js gzip	4.18 kB	4.18 kB	N/A
index-HASH.js gzip	257 B	256 B	N/A
link-HASH.js gzip	2.61 kB	2.61 kB	N/A
routerDirect..HASH.js gzip	310 B	311 B	N/A
script-HASH.js gzip	384 B	383 B	N/A
withRouter-HASH.js gzip	306 B	308 B	N/A
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Overall change	608 B	608 B	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js 01-26-revert_changes_to_process_default_routes_at_build	Change
_buildManifest.js gzip	484 B	484 B	✓
Overall change	484 B	484 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js 01-26-revert_changes_to_process_default_routes_at_build	Change
index.html gzip	528 B	527 B	N/A
link.html gzip	541 B	540 B	N/A
withRouter.html gzip	523 B	522 B	N/A
Overall change	0 B	0 B	✓

Edge SSR bundle Size

	vercel/next.js canary	vercel/next.js 01-26-revert_changes_to_process_default_routes_at_build	Change
edge-ssr.js gzip	94 kB	94 kB	N/A
page.js gzip	149 kB	149 kB	N/A
Overall change	0 B	0 B	✓

Middleware size

	vercel/next.js canary	vercel/next.js 01-26-revert_changes_to_process_default_routes_at_build	Change
middleware-b..fest.js gzip	625 B	621 B	N/A
middleware-r..fest.js gzip	151 B	149 B	N/A
middleware.js gzip	37.6 kB	37.6 kB	N/A
edge-runtime..pack.js gzip	1.92 kB	1.92 kB	✓
Overall change	1.92 kB	1.92 kB	✓

Next Runtimes

	vercel/next.js canary	vercel/next.js 01-26-revert_changes_to_process_default_routes_at_build	Change
app-page-exp...dev.js gzip	170 kB	170 kB	✓
app-page-exp..prod.js gzip	95.7 kB	95.7 kB	✓
app-page-tur..prod.js gzip	96.3 kB	96.3 kB	✓
app-page-tur..prod.js gzip	90.9 kB	90.9 kB	✓
app-page.run...dev.js gzip	142 kB	142 kB	✓
app-page.run..prod.js gzip	90.3 kB	90.3 kB	✓
app-route-ex...dev.js gzip	22.2 kB	22.2 kB	✓
app-route-ex..prod.js gzip	14.9 kB	14.9 kB	✓
app-route-tu..prod.js gzip	14.9 kB	14.9 kB	✓
app-route-tu..prod.js gzip	14.5 kB	14.5 kB	✓
app-route.ru...dev.js gzip	21.6 kB	21.6 kB	✓
app-route.ru..prod.js gzip	14.5 kB	14.5 kB	✓
pages-api-tu..prod.js gzip	9.42 kB	9.42 kB	✓
pages-api.ru...dev.js gzip	9.69 kB	9.69 kB	✓
pages-api.ru..prod.js gzip	9.42 kB	9.42 kB	✓
pages-turbo...prod.js gzip	22 kB	22 kB	✓
pages.runtim...dev.js gzip	22.6 kB	22.6 kB	✓
pages.runtim..prod.js gzip	22 kB	22 kB	✓
server.runti..prod.js gzip	49.7 kB	49.7 kB	✓
Overall change	932 kB	932 kB	✓

Commit: 01659a5