Fix deploy id env handling when disabled

[ijjk]

Ensure we properly omit the dpl fields when the experimental config isn't enabled but the env is present.

[vercel-spaces]

Notifying the following users due to files changed in this PR based on this repo's notify modifiers:

@timneutkens, @shuding, @styfle, @huozhi:

packages/next/src/server/config.ts

[ijjk]

Stats from current PR

Default Build

General Overall increase ⚠️

	vercel/next.js canary	ijjk/next.js fix/disabled-deploy-id	Change
buildDuration	12.1s	10.6s	N/A
buildDurationCached	6.1s	6.2s	N/A
nodeModulesSize	175 MB	175 MB	⚠️ +128 B
nextStartRea..uration (ms)	435ms	397ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	ijjk/next.js fix/disabled-deploy-id	Change
199-HASH.js gzip	32.3 kB	32.4 kB	N/A
3f784ff6-HASH.js gzip	53.2 kB	53.2 kB	N/A
99.HASH.js gzip	182 B	182 B	✓
framework-HASH.js gzip	45.5 kB	45.5 kB	✓
main-app-HASH.js gzip	254 B	252 B	N/A
main-HASH.js gzip	35.3 kB	35.4 kB	N/A
webpack-HASH.js gzip	1.75 kB	1.75 kB	N/A
Overall change	45.7 kB	45.7 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js fix/disabled-deploy-id	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js fix/disabled-deploy-id	Change
_app-HASH.js gzip	206 B	205 B	N/A
_error-HASH.js gzip	182 B	180 B	N/A
amp-HASH.js gzip	506 B	505 B	N/A
css-HASH.js gzip	322 B	323 B	N/A
dynamic-HASH.js gzip	2.59 kB	2.59 kB	✓
edge-ssr-HASH.js gzip	260 B	259 B	N/A
head-HASH.js gzip	350 B	350 B	✓
hooks-HASH.js gzip	369 B	369 B	✓
image-HASH.js gzip	4.38 kB	4.38 kB	N/A
index-HASH.js gzip	256 B	256 B	✓
link-HASH.js gzip	2.67 kB	2.67 kB	N/A
routerDirect..HASH.js gzip	316 B	318 B	N/A
script-HASH.js gzip	385 B	384 B	N/A
withRouter-HASH.js gzip	319 B	319 B	✓
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Overall change	3.99 kB	3.99 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js fix/disabled-deploy-id	Change
_buildManifest.js gzip	484 B	482 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js fix/disabled-deploy-id	Change
index.html gzip	528 B	530 B	N/A
link.html gzip	542 B	543 B	N/A
withRouter.html gzip	524 B	524 B	✓
Overall change	524 B	524 B	✓

Edge SSR bundle Size

	vercel/next.js canary	ijjk/next.js fix/disabled-deploy-id	Change
edge-ssr.js gzip	96 kB	96 kB	N/A
page.js gzip	140 kB	140 kB	N/A
Overall change	0 B	0 B	✓

Middleware size

	vercel/next.js canary	ijjk/next.js fix/disabled-deploy-id	Change
middleware-b..fest.js gzip	623 B	625 B	N/A
middleware-r..fest.js gzip	150 B	151 B	N/A
middleware.js gzip	25.8 kB	25.8 kB	✓
edge-runtime..pack.js gzip	1.92 kB	1.92 kB	✓
Overall change	27.8 kB	27.8 kB	✓

Commit: 9099188