Add support for Relay projects without artifactDirectory

[alunyov]

For the context: #33702 (comment)

This PR adds support for Relay projects that don't use artifactDirectory in their config.

• If the JS with GraphQL text is located in pages, the plugin with throw the error.
• If the JS file is outside of the pages - the plugin will require the generated artifact from __generated__ directory, next to the source file.

Test Plan:

• Manually tested for the first case:

• Updated the integration test

[ijjk]

Thanks for the PR!

[ijjk]

Stats from current PR

Default Build (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	alunyov/next.js relay-updates	Change
buildDuration	12.8s	12.9s	⚠️ +141ms
buildDurationCached	3.3s	3.3s	⚠️ +24ms
nodeModulesSize	359 MB	359 MB	⚠️ +7 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	alunyov/next.js relay-updates	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.024	3.01	-0.01
/ avg req/sec	826.73	830.49	+3.76
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.404	1.42	⚠️ +0.02
/error-in-render avg req/sec	1781.13	1760.2	⚠️ -20.93

Client Bundles (main, webpack, commons)

	vercel/next.js canary	alunyov/next.js relay-updates	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	27.3 kB	27.3 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	71.2 kB	71.2 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	alunyov/next.js relay-updates	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	alunyov/next.js relay-updates	Change
_app-HASH.js gzip	1.37 kB	1.37 kB	✓
_error-HASH.js gzip	194 B	194 B	✓
amp-HASH.js gzip	312 B	312 B	✓
css-HASH.js gzip	326 B	326 B	✓
dynamic-HASH.js gzip	2.37 kB	2.37 kB	✓
head-HASH.js gzip	350 B	350 B	✓
hooks-HASH.js gzip	919 B	919 B	✓
image-HASH.js gzip	4.94 kB	4.94 kB	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	2.19 kB	2.19 kB	✓
routerDirect..HASH.js gzip	321 B	321 B	✓
script-HASH.js gzip	383 B	383 B	✓
withRouter-HASH.js gzip	318 B	318 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	14.3 kB	14.3 kB	✓

Client Build Manifests

	vercel/next.js canary	alunyov/next.js relay-updates	Change
_buildManifest.js gzip	459 B	459 B	✓
Overall change	459 B	459 B	✓

Rendered Page Sizes

	vercel/next.js canary	alunyov/next.js relay-updates	Change
index.html gzip	531 B	531 B	✓
link.html gzip	545 B	545 B	✓
withRouter.html gzip	526 B	526 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Default Build with SWC (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	alunyov/next.js relay-updates	Change
buildDuration	16.2s	16.4s	⚠️ +126ms
buildDurationCached	3.3s	3.4s	⚠️ +107ms
nodeModulesSize	359 MB	359 MB	⚠️ +7 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	alunyov/next.js relay-updates	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.032	3.069	⚠️ +0.04
/ avg req/sec	824.51	814.51	⚠️ -10
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.417	1.445	⚠️ +0.03
/error-in-render avg req/sec	1764.31	1730.34	⚠️ -33.97

Client Bundles (main, webpack, commons)

	vercel/next.js canary	alunyov/next.js relay-updates	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.3 kB	42.3 kB	✓
main-HASH.js gzip	27.5 kB	27.5 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	71.4 kB	71.4 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	alunyov/next.js relay-updates	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	alunyov/next.js relay-updates	Change
_app-HASH.js gzip	1.35 kB	1.35 kB	✓
_error-HASH.js gzip	180 B	180 B	✓
amp-HASH.js gzip	305 B	305 B	✓
css-HASH.js gzip	321 B	321 B	✓
dynamic-HASH.js gzip	2.36 kB	2.36 kB	✓
head-HASH.js gzip	342 B	342 B	✓
hooks-HASH.js gzip	911 B	911 B	✓
image-HASH.js gzip	4.98 kB	4.98 kB	✓
index-HASH.js gzip	256 B	256 B	✓
link-HASH.js gzip	2.21 kB	2.21 kB	✓
routerDirect..HASH.js gzip	314 B	314 B	✓
script-HASH.js gzip	375 B	375 B	✓
withRouter-HASH.js gzip	309 B	309 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	14.3 kB	14.3 kB	✓

Client Build Manifests

	vercel/next.js canary	alunyov/next.js relay-updates	Change
_buildManifest.js gzip	458 B	458 B	✓
Overall change	458 B	458 B	✓

Rendered Page Sizes

	vercel/next.js canary	alunyov/next.js relay-updates	Change
index.html gzip	530 B	530 B	✓
link.html gzip	544 B	544 B	✓
withRouter.html gzip	525 B	525 B	✓
Overall change	1.6 kB	1.6 kB	✓

Commit: ae59954