Simplify RestorePackageJsonFiles target to use git checkout instead of manual file restoration

Co-authored-by: javiercn <6995051+javiercn@users.noreply.github.com>

Author: Copilot

eng/Npm.Workspace.nodeproj

@@ -73,17 +73,22 @@
   </Target>
 
   <Target Name="RestorePackageJsonFiles" AfterTargets="Build;Pack">
-    <Message Text="Restoring package.json files and package-lock.json from backups..." Importance="high" />
+    <Message Text="Restoring modified files using git checkout..." Importance="high" />
     <ItemGroup>
       <PackageJsonBackupFiles Include="$(RepoRoot)**/*.json.bak" />
+      <ModifiedPackageJsonFiles Include="@(PackageJsonBackupFiles -> Replace('.bak', ''))" />
     </ItemGroup>
-    <Move SourceFiles="@(PackageJsonBackupFiles)"
-          DestinationFiles="@(PackageJsonBackupFiles -> Replace('.bak', ''))"
-          Condition="@(PackageJsonBackupFiles) != ''" />
+    <!-- Restore package.json files from git -->
+    <Exec Command="git checkout -- &quot;%(ModifiedPackageJsonFiles.Identity)&quot;"
+          WorkingDirectory="$(RepoRoot)"
+          ContinueOnError="true"
+          Condition="@(ModifiedPackageJsonFiles) != ''" />
     <!-- Restore package-lock.json from git if it was modified -->
     <Exec Command="git checkout -- package-lock.json"
           WorkingDirectory="$(RepoRoot)"
           ContinueOnError="true" />
+    <!-- Clean up backup files -->
+    <Delete Files="@(PackageJsonBackupFiles)" Condition="@(PackageJsonBackupFiles) != ''" />
   </Target>
 
   <!-- Import Directory.Build.targets -->