Ensure @babel/core is not duplicated (#28716)

Follow-up to #28713 this ensures we also don't duplicate `@babel/core` in our `babel-packages` bundle. This was occurring from us re-using the `@babel/core` package name which causes us to remove it from the externals [here](https://github.com/vercel/next.js/blob/77c0e0937128409960ee48ee965501f4d18c9c82/packages/next/taskfile-ncc.js#L18-L21).

packages/next/compiled/babel-packages/package.json

@@ -1 +1 @@
-{"name":"@babel/core","main":"packages-bundle.js","author":"The Babel Team (https://babel.dev/team)","license":"MIT"}
+{"name":"babel-packages","main":"./packages-bundle.js"}

packages/next/taskfile.js

@@ -1,8 +1,9 @@
 // eslint-disable-next-line import/no-extraneous-dependencies
 const notifier = require('node-notifier')
 // eslint-disable-next-line import/no-extraneous-dependencies
-const { relative, basename, resolve } = require('path')
+const { relative, basename, resolve, join } = require('path')
 const { Module } = require('module')
+const fs = require('fs')
 
 // Note:
 // "bundles" folder shadows main node_modules in workspace where all installs in
@@ -155,12 +156,15 @@ export async function ncc_babel_bundle_packages(task, opts) {
   await task
     .source(opts.src || 'bundles/babel/packages-bundle.js')
     .ncc({
-      packageName: `@babel/core`,
-      bundleName: 'babel-packages',
       externals: externals,
     })
     .target(`compiled/babel-packages`)
 
+  await fs.promises.writeFile(
+    join(__dirname, 'compiled/babel-packages/package.json'),
+    JSON.stringify({ name: 'babel-packages', main: './packages-bundle.js' })
+  )
+
   await task
     .source(opts.src || 'bundles/babel/packages/*')
     .target('compiled/babel')