Remove hardecoded region in integ test

Author: aemada-aws

packages/@aws-cdk-testing/framework-integ/test/aws-ecs/test/integ.managedinstances-no-default-capacity-provider.ts

@@ -101,7 +101,6 @@ new ecs.FargateService(stack, 'ManagedInstancesService', {
 
 new integ.IntegTest(app, 'ManagedInstancesCapacityProviders', {
   testCases: [stack],
-  regions: ['us-west-2'],
 });
 
 app.synth();