Add initial handling for routing tests

[ijjk]

x-ref: #36618

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	ijjk/next.js add/routing-experiment-handling	Change
buildDuration	15.3s	15.4s	⚠️ +104ms
buildDurationCached	6.2s	6.1s	-91ms
nodeModulesSize	475 MB	475 MB	⚠️ +61.9 kB

Page Load Tests Overall increase ✓

	vercel/next.js canary	ijjk/next.js add/routing-experiment-handling	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.492	3.491	0
/ avg req/sec	715.88	716.22	+0.34
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.171	1.161	-0.01
/error-in-render avg req/sec	2135.38	2153.25	+17.87

Client Bundles (main, webpack)

	vercel/next.js canary	ijjk/next.js add/routing-experiment-handling	Change
925.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42 kB	42 kB	✓
main-HASH.js gzip	28.6 kB	28.6 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	72.3 kB	72.3 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js add/routing-experiment-handling	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js add/routing-experiment-handling	Change
_app-HASH.js gzip	1.36 kB	1.36 kB	✓
_error-HASH.js gzip	193 B	193 B	✓
amp-HASH.js gzip	308 B	308 B	✓
css-HASH.js gzip	327 B	327 B	✓
dynamic-HASH.js gzip	3.08 kB	3.08 kB	✓
head-HASH.js gzip	359 B	359 B	✓
hooks-HASH.js gzip	920 B	920 B	✓
image-HASH.js gzip	5.71 kB	5.71 kB	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	2.64 kB	2.64 kB	✓
routerDirect..HASH.js gzip	320 B	320 B	✓
script-HASH.js gzip	391 B	391 B	✓
withRouter-HASH.js gzip	318 B	318 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	16.3 kB	16.3 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js add/routing-experiment-handling	Change
_buildManifest.js gzip	459 B	459 B	✓
Overall change	459 B	459 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js add/routing-experiment-handling	Change
index.html gzip	531 B	531 B	✓
link.html gzip	544 B	544 B	✓
withRouter.html gzip	527 B	527 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Default Build with SWC (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	ijjk/next.js add/routing-experiment-handling	Change
buildDuration	17.2s	17.4s	⚠️ +159ms
buildDurationCached	6.1s	6.1s	-19ms
nodeModulesSize	475 MB	475 MB	⚠️ +61.9 kB

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	ijjk/next.js add/routing-experiment-handling	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.512	3.519	⚠️ +0.01
/ avg req/sec	711.88	710.34	⚠️ -1.54
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.181	1.185	0
/error-in-render avg req/sec	2116.11	2110.44	⚠️ -5.67

Client Bundles (main, webpack)

	vercel/next.js canary	ijjk/next.js add/routing-experiment-handling	Change
925.HASH.js gzip	178 B	178 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	29.1 kB	29.1 kB	✓
webpack-HASH.js gzip	1.45 kB	1.45 kB	✓
Overall change	73 kB	73 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js add/routing-experiment-handling	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js add/routing-experiment-handling	Change
_app-HASH.js gzip	1.35 kB	1.35 kB	✓
_error-HASH.js gzip	179 B	179 B	✓
amp-HASH.js gzip	312 B	312 B	✓
css-HASH.js gzip	324 B	324 B	✓
dynamic-HASH.js gzip	3.08 kB	3.08 kB	✓
head-HASH.js gzip	357 B	357 B	✓
hooks-HASH.js gzip	921 B	921 B	✓
image-HASH.js gzip	5.76 kB	5.76 kB	✓
index-HASH.js gzip	261 B	261 B	✓
link-HASH.js gzip	2.76 kB	2.76 kB	✓
routerDirect..HASH.js gzip	322 B	322 B	✓
script-HASH.js gzip	392 B	392 B	✓
withRouter-HASH.js gzip	317 B	317 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	16.5 kB	16.5 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js add/routing-experiment-handling	Change
_buildManifest.js gzip	458 B	458 B	✓
Overall change	458 B	458 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js add/routing-experiment-handling	Change
index.html gzip	529 B	529 B	✓
link.html gzip	543 B	543 B	✓
withRouter.html gzip	526 B	526 B	✓
Overall change	1.6 kB	1.6 kB	✓

Commit: f18982c