Update polling env var for tests in CI

[ijjk]

This updates to set the watchpack polling env variable when running tests in CI since it is used instead of chokidar with webpack 5

This also applies the suggestion from actions/runner-images#1187 to disable tcp/udp offloading to hopefully help with the network flakiness we've seen

[ijjk]

Stats from current PR

Default Build (Decrease detected ✓)

General Overall decrease ✓

	vercel/next.js canary	ijjk/next.js update/test-retry	Change
buildDuration	14.8s	14.9s	⚠️ +77ms
buildDurationCached	3.8s	3.7s	-11ms
nodeModulesSize	61.4 MB	61.4 MB	-2 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	ijjk/next.js update/test-retry	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.606	2.7	⚠️ +0.09
/ avg req/sec	959.16	925.87	⚠️ -33.29
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.464	1.506	⚠️ +0.04
/error-in-render avg req/sec	1707.88	1660.36	⚠️ -47.52

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js update/test-retry	Change
745.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	23.2 kB	23.2 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	67.1 kB	67.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js update/test-retry	Change
polyfills-a4..dd70.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js update/test-retry	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	ijjk/next.js update/test-retry	Change
_buildManifest.js gzip	492 B	492 B	✓
Overall change	492 B	492 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js update/test-retry	Change
index.html gzip	539 B	539 B	✓
link.html gzip	550 B	550 B	✓
withRouter.html gzip	532 B	532 B	✓
Overall change	1.62 kB	1.62 kB	✓

---

Webpack 4 Mode (Decrease detected ✓)

General Overall decrease ✓

	vercel/next.js canary	ijjk/next.js update/test-retry	Change
buildDuration	12.4s	12.4s	⚠️ +5ms
buildDurationCached	5.1s	5.1s	-55ms
nodeModulesSize	61.4 MB	61.4 MB	-2 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	ijjk/next.js update/test-retry	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.656	2.69	⚠️ +0.03
/ avg req/sec	941.15	929.44	⚠️ -11.71
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.466	1.453	-0.01
/error-in-render avg req/sec	1705.08	1720.53	+15.45

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js update/test-retry	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	10.6 kB	10.6 kB	✓
webpack-HASH.js gzip	1.19 kB	1.19 kB	✓
Overall change	68 kB	68 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js update/test-retry	Change
polyfills-a4..dd70.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js update/test-retry	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	2.98 kB	2.98 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	ijjk/next.js update/test-retry	Change
_buildManifest.js gzip	500 B	500 B	✓
Overall change	500 B	500 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js update/test-retry	Change
index.html gzip	585 B	585 B	✓
link.html gzip	597 B	597 B	✓
withRouter.html gzip	578 B	578 B	✓
Overall change	1.76 kB	1.76 kB	✓

Commit: c11da77

[sokra]

Whatever this kind of magic commands are for...