fix(turbopack): custom page extensions for _app

[ForsakenHarmony]

What?

The import alias had no way to resolve the page extensions and we already have them resolved in the PagesStructure, so with this PR we use the already resolved paths.

Closes PACK-2085
Fixes #59264

[ijjk]

Tests Passed

[ForsakenHarmony]

• canary
  • fix(turbopack): custom page extensions for _app #60789 👈

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[ijjk]

Stats from current PR

Default Build

General

	vercel/next.js canary	vercel/next.js hrmny/pack-2085-pageextensions-for-custom-app	Change
buildDuration	11.6s	11.7s	N/A
buildDurationCached	6s	4.9s	N/A
nodeModulesSize	200 MB	200 MB	✓
nextStartRea..uration (ms)	426ms	427ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	vercel/next.js hrmny/pack-2085-pageextensions-for-custom-app	Change
193.HASH.js gzip	181 B	182 B	N/A
3f784ff6-HASH.js gzip	53.4 kB	53.4 kB	✓
433-HASH.js gzip	29 kB	29 kB	N/A
framework-HASH.js gzip	45.2 kB	45.2 kB	✓
main-app-HASH.js gzip	239 B	242 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	N/A
Overall change	98.6 kB	98.6 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js hrmny/pack-2085-pageextensions-for-custom-app	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js hrmny/pack-2085-pageextensions-for-custom-app	Change
_app-HASH.js gzip	194 B	195 B	N/A
_error-HASH.js gzip	183 B	181 B	N/A
amp-HASH.js gzip	504 B	502 B	N/A
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	253 B	N/A
head-HASH.js gzip	350 B	349 B	N/A
hooks-HASH.js gzip	369 B	369 B	✓
image-HASH.js gzip	4.18 kB	4.18 kB	N/A
index-HASH.js gzip	255 B	256 B	N/A
link-HASH.js gzip	2.61 kB	2.61 kB	✓
routerDirect..HASH.js gzip	312 B	311 B	N/A
script-HASH.js gzip	385 B	383 B	N/A
withRouter-HASH.js gzip	307 B	308 B	N/A
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Overall change	3.4 kB	3.4 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js hrmny/pack-2085-pageextensions-for-custom-app	Change
_buildManifest.js gzip	484 B	485 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js hrmny/pack-2085-pageextensions-for-custom-app	Change
index.html gzip	528 B	525 B	N/A
link.html gzip	540 B	538 B	N/A
withRouter.html gzip	524 B	522 B	N/A
Overall change	0 B	0 B	✓

Edge SSR bundle Size

	vercel/next.js canary	vercel/next.js hrmny/pack-2085-pageextensions-for-custom-app	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 hrmny/pack-2085-pageextensions-for-custom-app	Change
middleware-b..fest.js gzip	625 B	626 B	N/A
middleware-r..fest.js gzip	151 B	151 B	✓
middleware.js gzip	37.5 kB	37.5 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	vercel/next.js hrmny/pack-2085-pageextensions-for-custom-app	Change
app-page-exp...dev.js gzip	169 kB	169 kB	✓
app-page-exp..prod.js gzip	95.6 kB	95.6 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	90.2 kB	90.2 kB	✓
app-route-ex...dev.js gzip	24.2 kB	24.2 kB	✓
app-route-ex..prod.js gzip	16.9 kB	16.9 kB	✓
app-route-tu..prod.js gzip	16.9 kB	16.9 kB	✓
app-route-tu..prod.js gzip	16.4 kB	16.4 kB	✓
app-route.ru...dev.js gzip	23.6 kB	23.6 kB	✓
app-route.ru..prod.js gzip	16.4 kB	16.4 kB	✓
pages-api-tu..prod.js gzip	9.41 kB	9.41 kB	✓
pages-api.ru...dev.js gzip	9.68 kB	9.68 kB	✓
pages-api.ru..prod.js gzip	9.4 kB	9.4 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	944 kB	944 kB	✓

Commit: 61e6e43