Pass locales to getStaticPaths for i18n

[ijjk]

This makes sure the locales are passed to getStaticPaths and also disables the removing the default locale from the path when the default locale is the preferred header. It also updates tests to ensure the domain redirects are working as expected.

x-ref: #17370

[ijjk]

Stats from current PR

Default Server Mode (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
buildDuration	11.5s	11.6s	⚠️ +112ms
nodeModulesSize	62.5 MB	62.5 MB	⚠️ +1.85 kB

Page Load Tests Overall increase ✓

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.056	2.109	⚠️ +0.05
/ avg req/sec	1215.85	1185.41	⚠️ -30.44
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.184	1.142	-0.04
/error-in-render avg req/sec	2112.13	2189.81	+77.68

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
677f882d2ed8..35e7.js gzip	11.1 kB	11.1 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-0297b89..3d55.js gzip	7.34 kB	7.34 kB	✓
webpack-e067..f178.js gzip	751 B	751 B	✓
Overall change	58.1 kB	58.1 kB	✓

Client Bundles (main, webpack, commons) Modern

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
677f882d2ed8..dule.js gzip	6.94 kB	6.94 kB	✓
framework.HA..dule.js gzip	39 kB	39 kB	✓
main-8539e6d..dule.js gzip	6.32 kB	6.32 kB	✓
webpack-07c5..dule.js gzip	751 B	751 B	✓
Overall change	53 kB	53 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
polyfills-4b..e242.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
_app-9a0b9e1..b37e.js gzip	1.28 kB	1.28 kB	✓
_error-ed1b0..8fbd.js gzip	3.44 kB	3.44 kB	✓
hooks-89731c..c609.js gzip	887 B	887 B	✓
index-17468f..5d83.js gzip	227 B	227 B	✓
link-89ad9e7..25bb.js gzip	1.34 kB	1.34 kB	✓
routerDirect..924c.js gzip	284 B	284 B	✓
withRouter-7..c13d.js gzip	284 B	284 B	✓
Overall change	7.74 kB	7.74 kB	✓

Client Pages Modern

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
_app-75d3a82..dule.js gzip	625 B	625 B	✓
_error-4469a..dule.js gzip	2.29 kB	2.29 kB	✓
hooks-cbf13f..dule.js gzip	387 B	387 B	✓
index-b9a643..dule.js gzip	226 B	226 B	✓
link-aeb707b..dule.js gzip	1.29 kB	1.29 kB	✓
routerDirect..dule.js gzip	284 B	284 B	✓
withRouter-f..dule.js gzip	282 B	282 B	✓
Overall change	5.39 kB	5.39 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
_buildManifest.js gzip	322 B	322 B	✓
_buildManife..dule.js gzip	329 B	329 B	✓
Overall change	651 B	651 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
index.html gzip	1 kB	1 kB	✓
link.html gzip	1.01 kB	1.01 kB	✓
withRouter.html gzip	996 B	996 B	✓
Overall change	3.01 kB	3.01 kB	✓

---

Serverless Mode

General Overall increase ⚠️

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
buildDuration	13s	13s	-65ms
nodeModulesSize	62.5 MB	62.5 MB	⚠️ +1.85 kB

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
677f882d2ed8..35e7.js gzip	11.1 kB	11.1 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-0297b89..3d55.js gzip	7.34 kB	7.34 kB	✓
webpack-e067..f178.js gzip	751 B	751 B	✓
Overall change	58.1 kB	58.1 kB	✓

Client Bundles (main, webpack, commons) Modern

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
677f882d2ed8..dule.js gzip	6.94 kB	6.94 kB	✓
framework.HA..dule.js gzip	39 kB	39 kB	✓
main-8539e6d..dule.js gzip	6.32 kB	6.32 kB	✓
webpack-07c5..dule.js gzip	751 B	751 B	✓
Overall change	53 kB	53 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
polyfills-4b..e242.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
_app-9a0b9e1..b37e.js gzip	1.28 kB	1.28 kB	✓
_error-ed1b0..8fbd.js gzip	3.44 kB	3.44 kB	✓
hooks-89731c..c609.js gzip	887 B	887 B	✓
index-17468f..5d83.js gzip	227 B	227 B	✓
link-89ad9e7..25bb.js gzip	1.34 kB	1.34 kB	✓
routerDirect..924c.js gzip	284 B	284 B	✓
withRouter-7..c13d.js gzip	284 B	284 B	✓
Overall change	7.74 kB	7.74 kB	✓

Client Pages Modern

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
_app-75d3a82..dule.js gzip	625 B	625 B	✓
_error-4469a..dule.js gzip	2.29 kB	2.29 kB	✓
hooks-cbf13f..dule.js gzip	387 B	387 B	✓
index-b9a643..dule.js gzip	226 B	226 B	✓
link-aeb707b..dule.js gzip	1.29 kB	1.29 kB	✓
routerDirect..dule.js gzip	284 B	284 B	✓
withRouter-f..dule.js gzip	282 B	282 B	✓
Overall change	5.39 kB	5.39 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
_buildManifest.js gzip	322 B	322 B	✓
_buildManife..dule.js gzip	329 B	329 B	✓
Overall change	651 B	651 B	✓

Serverless bundles

	vercel/next.js canary	ijjk/next.js i18n/gsp-follow-ups	Change
_error.js	1.06 MB	1.06 MB	✓
404.html	4.34 kB	4.34 kB	✓
hooks.html	3.92 kB	3.92 kB	✓
index.js	1.06 MB	1.06 MB	✓
link.js	1.1 MB	1.1 MB	✓
routerDirect.js	1.1 MB	1.1 MB	✓
withRouter.js	1.1 MB	1.1 MB	✓
Overall change	5.42 MB	5.42 MB	✓

Commit: 0a9b67f