Refs #37102 - detect plugins webpack by looking for remoteEntry.js

Since we switched to Webpack 5, there are no more manifest.json in the
plugins webpack folder, but we need some token to detect that we gotta
load webpack stuff.

app/registries/foreman/plugin/assets.rb

@@ -30,8 +30,14 @@ def webpack_manifest_path
         File.file?(manifest_path) ? manifest_path : nil
       end
 
+      def webpack_remote_entry
+        webpack_id = id.to_s.tr('-', '_')
+        remote_entry_path = File.join(path, 'public', 'webpack', webpack_id, "#{webpack_id}_remoteEntry.js")
+        File.file?(remote_entry_path) ? remote_entry_path : nil
+      end
+
       def uses_webpack?
-        path && (File.file?(File.join(path, 'webpack', 'index.js')) || webpack_manifest_path.present?)
+        path && (File.file?(File.join(path, 'webpack', 'index.js')) || webpack_manifest_path.present? || webpack_remote_entry.present?)
       end
 
       private