[flutter_tools] make android deps no longer required for flutter doctor (#68533)

packages/flutter_tools/lib/src/commands/doctor.dart

@@ -25,13 +25,6 @@ class DoctorCommand extends FlutterCommand {
   @override
   final String name = 'doctor';
 
-  @override
-  Future<Set<DevelopmentArtifact>> get requiredArtifacts async => <DevelopmentArtifact>{
-    // This is required because the gradle host-only tests do not correctly specify
-    // their dependencies.
-    DevelopmentArtifact.androidGenSnapshot,
-  };
-
   @override
   final String description = 'Show information about the installed tooling.';