webpack: tweak config for split chunks (#55054)

Slight tweaks to the dev config for split chunks.

I disabled the default groups for chunking to make sure we only chunked
the ones from the node_modules + augmented the number of parallel
requests possible per Tobias suggestion.

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packages/next/src/build/webpack-config.ts

@@ -1731,6 +1731,9 @@ export default async function getBaseWebpackConfig(
                   reuseExistingChunk: true,
                   test: /[\\/]node_modules[\\/]/,
                   minSize: 0,
+                  minChunks: 1,
+                  maxAsyncRequests: 300,
+                  maxInitialRequests: 300,
                   name: (module: webpack.Module) => {
                     const moduleId = module.nameForCondition()!
                     const rootModule = extractRootNodeModule(moduleId)
@@ -1743,6 +1746,9 @@ export default async function getBaseWebpackConfig(
                     }
                   },
                 },
+                // disable the default chunk groups
+                default: false,
+                defaultVendors: false,
               },
             }
           }