remove commons chunk config (#34445)

This removes the config for the `commons` chunk.

I think the idea was that modules are that in all pages are put into a `commons` chunk, but that breaks when next/dynamic comes into play, which also creates chunks. So the `totalPages` condition is broken and could lead to too many modules placed into the commons chunk.

Example: 2 pages, each has one next/dynamic. Both on demand chunks include module A. page 1 includes module B and next/dynamic on page 2 includes module B. A and B are placed into commons. commonjs chunk is loaded in page 1 and both next/dynamic. Page 1 would load module A even while it doesn't need it.

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `yarn lint`

packages/next/build/webpack-config.ts

@@ -791,11 +791,6 @@ export default async function getBaseWebpackConfig(
             minChunks: 1,
             reuseExistingChunk: true,
           },
-          commons: {
-            name: 'commons',
-            minChunks: totalPages,
-            priority: 20,
-          },
           middleware: {
             chunks: (chunk: webpack.compilation.Chunk) =>
               chunk.name?.match(MIDDLEWARE_ROUTE),

test/.stats-app/stats-config.js

@@ -9,7 +9,7 @@ const imagePageData = fs.readFileSync(
 
 const clientGlobs = [
   {
-    name: 'Client Bundles (main, webpack, commons)',
+    name: 'Client Bundles (main, webpack)',
     globs: [
       '.next/static/runtime/+(main|webpack)-*',
       '.next/static/chunks/!(polyfills*)',