feat(upgrade): prevent changing the structure of package.json file during upgrade (#7167)

Co-authored-by: blzsaa <blzsaa@users.noreply.github.com>

packages/@vue/cli/lib/Generator.js

@@ -192,7 +192,8 @@ module.exports = class Generator {
 
   async generate ({
     extractConfigFiles = false,
-    checkExisting = false
+    checkExisting = false,
+    sortPackageJson = true
   } = {}) {
     await this.initPlugins()
 
@@ -203,7 +204,9 @@ module.exports = class Generator {
     // wait for file resolve
     await this.resolveFiles()
     // set package.json
-    this.sortPkg()
+    if (sortPackageJson) {
+      this.sortPkg()
+    }
     this.files['package.json'] = JSON.stringify(this.pkg, null, 2) + '\n'
     // write/update file tree to disk
     await writeFileTree(this.context, this.files, initialFiles, this.filesModifyRecord)

packages/@vue/cli/lib/migrate.js

@@ -31,7 +31,8 @@ async function runMigrator (context, plugin, pkg = getPkg(context)) {
   log(`🚀  Running migrator of ${plugin.id}`)
   await migrator.generate({
     extractConfigFiles: true,
-    checkExisting: true
+    checkExisting: true,
+    sortPackageJson: false
   })
 
   const newDeps = migrator.pkg.dependencies