Update github labeler with eslint-plugin-next

[styfle]

The eslint-plugin-next package should be considered a "core" package since it powers the next lint command

[ijjk]

Stats from current PR

Default Build (Decrease detected ✓)

General

	vercel/next.js canary	vercel/next.js add-next-lint-to-core	Change
buildDuration	10.8s	10.9s	⚠️ +136ms
buildDurationCached	2.8s	2.8s	-18ms
nodeModulesSize	49.1 MB	49.1 MB	✓

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	vercel/next.js add-next-lint-to-core	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.082	2.135	⚠️ +0.05
/ avg req/sec	1200.94	1170.7	⚠️ -30.24
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.164	1.2	⚠️ +0.04
/error-in-render avg req/sec	2147.94	2083.85	⚠️ -64.09

Client Bundles (main, webpack, commons)

	vercel/next.js canary	vercel/next.js add-next-lint-to-core	Change
745.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	23.3 kB	23.3 kB	✓
webpack-HASH.js gzip	1.45 kB	1.45 kB	✓
Overall change	67.2 kB	67.2 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js add-next-lint-to-core	Change
polyfills-a4..dd70.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js add-next-lint-to-core	Change
_app-HASH.js gzip	979 B	979 B	✓
_error-HASH.js gzip	194 B	194 B	✓
amp-HASH.js gzip	312 B	312 B	✓
css-HASH.js gzip	329 B	329 B	✓
dynamic-HASH.js gzip	2.67 kB	2.67 kB	✓
head-HASH.js gzip	351 B	351 B	✓
hooks-HASH.js gzip	918 B	918 B	✓
image-HASH.js gzip	4.14 kB	4.14 kB	✓
index-HASH.js gzip	261 B	261 B	✓
link-HASH.js gzip	1.66 kB	1.66 kB	✓
routerDirect..HASH.js gzip	318 B	318 B	✓
script-HASH.js gzip	387 B	387 B	✓
withRouter-HASH.js gzip	320 B	320 B	✓
bb14e60e810b..30f.css gzip	125 B	125 B	✓
Overall change	13 kB	13 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js add-next-lint-to-core	Change
_buildManifest.js gzip	492 B	492 B	✓
Overall change	492 B	492 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js add-next-lint-to-core	Change
index.html gzip	541 B	541 B	✓
link.html gzip	553 B	553 B	✓
withRouter.html gzip	533 B	533 B	✓
Overall change	1.63 kB	1.63 kB	✓

---

Webpack 4 Mode (Decrease detected ✓)

General

	vercel/next.js canary	vercel/next.js add-next-lint-to-core	Change
buildDuration	8.9s	9.4s	⚠️ +517ms
buildDurationCached	3.7s	3.7s	⚠️ +18ms
nodeModulesSize	49.1 MB	49.1 MB	✓

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	vercel/next.js add-next-lint-to-core	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.115	2.255	⚠️ +0.14
/ avg req/sec	1182.19	1108.5	⚠️ -73.69
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.177	1.282	⚠️ +0.1
/error-in-render avg req/sec	2124.52	1950.74	⚠️ -173.78

Client Bundles (main, webpack, commons)

	vercel/next.js canary	vercel/next.js add-next-lint-to-core	Change
16.HASH.js gzip	186 B	186 B	✓
677f882d2ed8..HASH.js gzip	14.1 kB	14.1 kB	✓
framework.HASH.js gzip	41.9 kB	41.9 kB	✓
main-HASH.js gzip	10.7 kB	10.7 kB	✓
webpack-HASH.js gzip	1.19 kB	1.19 kB	✓
Overall change	68.1 kB	68.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js add-next-lint-to-core	Change
polyfills-a4..dd70.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js add-next-lint-to-core	Change
_app-HASH.js gzip	964 B	964 B	✓
_error-HASH.js gzip	3.8 kB	3.8 kB	✓
amp-HASH.js gzip	552 B	552 B	✓
css-HASH.js gzip	333 B	333 B	✓
dynamic-HASH.js gzip	2.87 kB	2.87 kB	✓
head-HASH.js gzip	3.06 kB	3.06 kB	✓
hooks-HASH.js gzip	924 B	924 B	✓
index-HASH.js gzip	231 B	231 B	✓
link-HASH.js gzip	1.64 kB	1.64 kB	✓
routerDirect..HASH.js gzip	298 B	298 B	✓
script-HASH.js gzip	3.03 kB	3.03 kB	✓
withRouter-HASH.js gzip	295 B	295 B	✓
30809af5c834..565.css gzip	125 B	125 B	✓
Overall change	18.1 kB	18.1 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js add-next-lint-to-core	Change
_buildManifest.js gzip	500 B	500 B	✓
Overall change	500 B	500 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js add-next-lint-to-core	Change
index.html gzip	584 B	584 B	✓
link.html gzip	596 B	596 B	✓
withRouter.html gzip	577 B	577 B	✓
Overall change	1.76 kB	1.76 kB	✓

Commit: ded5ff2