Show unsupported devices when no supported devices are connected (#56531)

packages/flutter_tools/lib/src/device.dart

diff --git a/packages/flutter_tools/lib/src/device.dart b/packages/flutter_tools/lib/src/device.dart
index 6c19930..59f5b25 100644
--- a/packages/flutter_tools/lib/src/device.dart
+++ b/packages/flutter_tools/lib/src/device.dart
@@ -557,6 +557,13 @@
     await descriptions(devices).forEach(globals.printStatus);
   }
 
+  static List<String> devicesPlatformTypes(List<Device> devices) {
+    return devices
+        .map(
+          (Device d) => d.platformType.toString(),
+        ).toSet().toList()..sort();
+  }
+
   /// Convert the Device object to a JSON representation suitable for serialization.
   Future<Map<String, Object>> toJson() async {
     final bool isLocalEmu = await isLocalEmulator;