Remove wasm target

[padmaia]

This PR removes the wasm target for the next-swc build for the next major version. The main motivation is that Turbopack does not support targeting wasm yet, and it would be a significant amount of work to add. We plan to make Turbopack the default zero-config experience in a minor version, possibly before we are able to support a wasm target, so we need to make this breaking change now. We also plan to make more improvements to the webpack experience with shared Rust code, which we have so far been blocked from implementing because of the current wasm restrictions. We would like to support a wasm target again in the future, but cannot say at this time when that would be.

Closes WEB-1865

[ijjk]

Stats from current PR

Default Build

General

	vercel/next.js canary	padmaia/next.js remove-wasm-target	Change
buildDuration	10.1s	10.3s	⚠️ +161ms
buildDurationCached	6s	6s	N/A
nodeModulesSize	175 MB	175 MB	N/A
nextStartRea..uration (ms)	419ms	415ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	padmaia/next.js remove-wasm-target	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	253 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	padmaia/next.js remove-wasm-target	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	padmaia/next.js remove-wasm-target	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	padmaia/next.js remove-wasm-target	Change
_buildManifest.js gzip	484 B	482 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	padmaia/next.js remove-wasm-target	Change
index.html gzip	529 B	530 B	N/A
link.html gzip	541 B	542 B	N/A
withRouter.html gzip	523 B	523 B	✓
Overall change	523 B	523 B	✓

Edge SSR bundle Size

	vercel/next.js canary	padmaia/next.js remove-wasm-target	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	padmaia/next.js remove-wasm-target	Change
middleware-b..fest.js gzip	625 B	622 B	N/A
middleware-r..fest.js gzip	150 B	151 B	N/A
middleware.js gzip	25.6 kB	25.6 kB	N/A
edge-runtime..pack.js gzip	1.92 kB	1.92 kB	✓
Overall change	1.92 kB	1.92 kB	✓

Commit: e846636