[flutter_tools] remove flaky web vm service test (#98540)

packages/flutter_tools/test/web.shard/vm_service_web_test.dart

@@ -88,26 +88,6 @@ void main() {
         await vmServiceConnectUri('${flutter.vmServiceWsUri}');
       await validateFlutterVersion(client);
     });
-
-
-    testWithoutContext('can validate flutter version in parallel', () async {
-      await flutter.run(
-        withDebugger: true, chrome: true,
-        additionalCommandArgs: <String>['--verbose', '--web-renderer=html']);
-
-      expect(flutter.vmServiceWsUri, isNotNull);
-
-      final VmService client1 =
-        await vmServiceConnectUri('${flutter.vmServiceWsUri}');
-
-      final VmService client2 =
-        await vmServiceConnectUri('${flutter.vmServiceWsUri}');
-
-      await Future.wait(<Future<void>>[
-        validateFlutterVersion(client1),
-        validateFlutterVersion(client2)]
-      );
-    });
   });
 }