Update safari preload test

[ijjk]

This fixes the safari production preload test as we no longer generate preloads with the optimized loading strategy and defer scripts are generated instead.

Bug

• Related issues linked using fixes #number
• Integration tests added

Feature

• Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
• Related issues linked using fixes #number
• Integration tests added
• Documentation added
• Telemetry added. In case of a feature if it's used or not.

Documentation / Examples

• Make sure the linting passes

[ijjk]

Stats from current PR

Default Server Mode (Decrease detected ✓)

General

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
buildDuration	14.4s	14.8s	⚠️ +362ms
buildDurationCached	3.6s	3.7s	⚠️ +101ms
nodeModulesSize	46.5 MB	46.5 MB	✓

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.695	2.774	⚠️ +0.08
/ avg req/sec	927.49	901.29	⚠️ -26.2
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.735	1.719	-0.02
/error-in-render avg req/sec	1440.65	1454.08	+13.43

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
framework-HASH.js gzip	39.3 kB	39.3 kB	✓
main-HASH.js gzip	20.2 kB	20.2 kB	✓
webpack-HASH.js gzip	804 B	804 B	✓
Overall change	60.3 kB	60.3 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
polyfills-HASH.js gzip	31.1 kB	31.1 kB	✓
Overall change	31.1 kB	31.1 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
_app-HASH.js gzip	801 B	801 B	✓
_error-HASH.js gzip	3.17 kB	3.17 kB	✓
amp-HASH.js gzip	527 B	527 B	✓
css-HASH.js gzip	334 B	334 B	✓
hooks-HASH.js gzip	890 B	890 B	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	1.64 kB	1.64 kB	✓
routerDirect..HASH.js gzip	333 B	333 B	✓
withRouter-HASH.js gzip	330 B	330 B	✓
bb14e60e810b..30f.css gzip	125 B	125 B	✓
Overall change	8.41 kB	8.41 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
_buildManifest.js gzip	391 B	391 B	✓
Overall change	391 B	391 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
index.html gzip	522 B	522 B	✓
link.html gzip	535 B	535 B	✓
withRouter.html gzip	516 B	516 B	✓
Overall change	1.57 kB	1.57 kB	✓

---

Serverless Mode (Decrease detected ✓)

General

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
buildDuration	16.6s	16.6s	-23ms
buildDurationCached	4.8s	4.7s	-74ms
nodeModulesSize	46.5 MB	46.5 MB	✓

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
framework-HASH.js gzip	39.3 kB	39.3 kB	✓
main-HASH.js gzip	20.2 kB	20.2 kB	✓
webpack-HASH.js gzip	804 B	804 B	✓
Overall change	60.3 kB	60.3 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
polyfills-HASH.js gzip	31.1 kB	31.1 kB	✓
Overall change	31.1 kB	31.1 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
_app-HASH.js gzip	801 B	801 B	✓
_error-HASH.js gzip	3.17 kB	3.17 kB	✓
amp-HASH.js gzip	527 B	527 B	✓
css-HASH.js gzip	334 B	334 B	✓
hooks-HASH.js gzip	890 B	890 B	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	1.64 kB	1.64 kB	✓
routerDirect..HASH.js gzip	333 B	333 B	✓
withRouter-HASH.js gzip	330 B	330 B	✓
bb14e60e810b..30f.css gzip	125 B	125 B	✓
Overall change	8.41 kB	8.41 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
_buildManifest.js gzip	391 B	391 B	✓
Overall change	391 B	391 B	✓

Serverless bundles Overall decrease ✓

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
_error.js	16.9 kB	16.9 kB	✓
404.html	1.98 kB	1.98 kB	✓
500.html	1.96 kB	1.96 kB	✓
amp.amp.html	10.8 kB	10.8 kB	✓
amp.html	1.17 kB	1.17 kB	✓
css.html	1.35 kB	1.35 kB	✓
hooks.html	1.23 kB	1.23 kB	✓
index.js	17.2 kB	17.2 kB	✓
link.js	17.4 kB	17.4 kB	✓
routerDirect.js	17.4 kB	17.4 kB	✓
withRouter.js	17.4 kB	17.4 kB	-2 B
Overall change	105 kB	105 kB	-2 B

---

Webpack 4 Mode (Decrease detected ✓)

General

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
buildDuration	12.9s	12.8s	-131ms
buildDurationCached	5.4s	5.4s	⚠️ +9ms
nodeModulesSize	46.5 MB	46.5 MB	✓

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.751	2.74	-0.01
/ avg req/sec	908.89	912.37	+3.48
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.761	1.82	⚠️ +0.06
/error-in-render avg req/sec	1419.75	1373.27	⚠️ -46.48

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
677f882d2ed8..HASH.js gzip	13.4 kB	13.4 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-HASH.js gzip	7.99 kB	7.99 kB	✓
webpack-HASH.js gzip	751 B	751 B	✓
Overall change	61.1 kB	61.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
polyfills-HASH.js gzip	31.3 kB	31.3 kB	✓
Overall change	31.3 kB	31.3 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
_app-HASH.js gzip	1.07 kB	1.07 kB	✓
_error-HASH.js gzip	3.84 kB	3.84 kB	✓
amp-HASH.js gzip	536 B	536 B	✓
css-HASH.js gzip	339 B	339 B	✓
hooks-HASH.js gzip	887 B	887 B	✓
index-HASH.js gzip	227 B	227 B	✓
link-HASH.js gzip	1.63 kB	1.63 kB	✓
routerDirect..HASH.js gzip	303 B	303 B	✓
withRouter-HASH.js gzip	302 B	302 B	✓
e025d2764813..52f.css gzip	125 B	125 B	✓
Overall change	9.27 kB	9.27 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
_buildManifest.js gzip	420 B	420 B	✓
Overall change	420 B	420 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js update/safari-test	Change
index.html gzip	568 B	568 B	✓
link.html gzip	582 B	582 B	✓
withRouter.html gzip	561 B	561 B	✓
Overall change	1.71 kB	1.71 kB	✓

Commit: 60418e4