feat(client-shield): Add v2 smoke tests and smithy smokeTests trait for SDK testing.

Author: awstools

Diff for: codegen/sdk-codegen/aws-models/shield.json

@@ -2979,7 +2979,20 @@
           "outputToken": "NextToken",
           "items": "AttackSummaries",
           "pageSize": "MaxResults"
-        }
+        },
+        "smithy.test#smokeTests": [
+          {
+            "id": "ListAttacksSuccess",
+            "params": {},
+            "vendorParams": {
+              "region": "us-east-1"
+            },
+            "vendorParamsShape": "aws.test#AwsVendorParams",
+            "expect": {
+              "success": {}
+            }
+          }
+        ]
       }
     },
     "com.amazonaws.shield#ListAttacksRequest": {