feat(client-application-auto-scaling): add v2 smoke tests and smithy smokeTests trait for SDK testing.

Author: awstools

codegen/sdk-codegen/aws-models/application-auto-scaling.json

@@ -1487,7 +1487,22 @@
           "outputToken": "NextToken",
           "items": "ScalableTargets",
           "pageSize": "MaxResults"
-        }
+        },
+        "smithy.test#smokeTests": [
+          {
+            "id": "DescribeScalableTargetsSuccess",
+            "params": {
+              "ServiceNamespace": "ec2"
+            },
+            "vendorParams": {
+              "region": "us-west-2"
+            },
+            "vendorParamsShape": "aws.test#AwsVendorParams",
+            "expect": {
+              "success": {}
+            }
+          }
+        ]
       }
     },
     "com.amazonaws.applicationautoscaling#DescribeScalableTargetsRequest": {