fix(stepfunctions-tasks): sageMakerCreateTrainingJob does not correctly support empty inputDataConfig (#31210)

### Issue # (if applicable)

Closes #31132.

### Reason for this change

`inputDataConfig` is not a required property in the API:
https://docs.aws.amazon.com/sagemaker/latest/APIReference/API_CreateTrainingJob.html#sagemaker-CreateTrainingJob-request-InputDataConfig

However in `SageMakerCreateTrainingJob`, it's marked as required. We should make it align with the API.

### Description of changes

Make the property optional.

### Description of how you validated changes

unit test and integration test

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: xazhao

packages/@aws-cdk-testing/framework-integ/test/aws-stepfunctions-tasks/test/sagemaker/integ.create-training-job.js.snapshot/cdk.out

@@ -332,13 +332,251 @@
    ],
    "UpdateReplacePolicy": "Delete",
    "DeletionPolicy": "Delete"
+  },
+  "TrainTaskAnotherSagemakerRoleBD8363A2": {
+   "Type": "AWS::IAM::Role",
+   "Properties": {
+    "AssumeRolePolicyDocument": {
+     "Statement": [
+      {
+       "Action": "sts:AssumeRole",
+       "Effect": "Allow",
+       "Principal": {
+        "Service": "sagemaker.amazonaws.com"
+       }
+      }
+     ],
+     "Version": "2012-10-17"
+    },
+    "Policies": [
+     {
+      "PolicyDocument": {
+       "Statement": [
+        {
+         "Action": [
+          "cloudwatch:PutMetricData",
+          "ecr:GetAuthorizationToken",
+          "logs:CreateLogGroup",
+          "logs:CreateLogStream",
+          "logs:DescribeLogStreams",
+          "logs:PutLogEvents"
+         ],
+         "Effect": "Allow",
+         "Resource": "*"
+        }
+       ],
+       "Version": "2012-10-17"
+      },
+      "PolicyName": "CreateTrainingJob"
+     }
+    ]
+   }
+  },
+  "TrainTaskAnotherSagemakerRoleDefaultPolicy67E5C282": {
+   "Type": "AWS::IAM::Policy",
+   "Properties": {
+    "PolicyDocument": {
+     "Statement": [
+      {
+       "Action": [
+        "s3:Abort*",
+        "s3:DeleteObject*",
+        "s3:PutObject",
+        "s3:PutObjectLegalHold",
+        "s3:PutObjectRetention",
+        "s3:PutObjectTagging",
+        "s3:PutObjectVersionTagging"
+       ],
+       "Effect": "Allow",
+       "Resource": [
+        {
+         "Fn::GetAtt": [
+          "TrainingData3FDB6D34",
+          "Arn"
+         ]
+        },
+        {
+         "Fn::Join": [
+          "",
+          [
+           {
+            "Fn::GetAtt": [
+             "TrainingData3FDB6D34",
+             "Arn"
+            ]
+           },
+           "/result/*"
+          ]
+         ]
+        }
+       ]
+      },
+      {
+       "Action": [
+        "kms:Decrypt",
+        "kms:Encrypt",
+        "kms:GenerateDataKey*",
+        "kms:ReEncrypt*"
+       ],
+       "Effect": "Allow",
+       "Resource": {
+        "Fn::GetAtt": [
+         "EncryptionKey1B843E66",
+         "Arn"
+        ]
+       }
+      }
+     ],
+     "Version": "2012-10-17"
+    },
+    "PolicyName": "TrainTaskAnotherSagemakerRoleDefaultPolicy67E5C282",
+    "Roles": [
+     {
+      "Ref": "TrainTaskAnotherSagemakerRoleBD8363A2"
+     }
+    ]
+   }
+  },
+  "StateMachineAnotherRoleB3F4936A": {
+   "Type": "AWS::IAM::Role",
+   "Properties": {
+    "AssumeRolePolicyDocument": {
+     "Statement": [
+      {
+       "Action": "sts:AssumeRole",
+       "Effect": "Allow",
+       "Principal": {
+        "Service": "states.amazonaws.com"
+       }
+      }
+     ],
+     "Version": "2012-10-17"
+    }
+   }
+  },
+  "StateMachineAnotherRoleDefaultPolicy5D4FD497": {
+   "Type": "AWS::IAM::Policy",
+   "Properties": {
+    "PolicyDocument": {
+     "Statement": [
+      {
+       "Action": [
+        "sagemaker:CreateTrainingJob",
+        "sagemaker:DescribeTrainingJob",
+        "sagemaker:StopTrainingJob"
+       ],
+       "Effect": "Allow",
+       "Resource": {
+        "Fn::Join": [
+         "",
+         [
+          "arn:",
+          {
+           "Ref": "AWS::Partition"
+          },
+          ":sagemaker:",
+          {
+           "Ref": "AWS::Region"
+          },
+          ":",
+          {
+           "Ref": "AWS::AccountId"
+          },
+          ":training-job/mytrainingjob*"
+         ]
+        ]
+       }
+      },
+      {
+       "Action": "sagemaker:ListTags",
+       "Effect": "Allow",
+       "Resource": "*"
+      },
+      {
+       "Action": "iam:PassRole",
+       "Condition": {
+        "StringEquals": {
+         "iam:PassedToService": "sagemaker.amazonaws.com"
+        }
+       },
+       "Effect": "Allow",
+       "Resource": {
+        "Fn::GetAtt": [
+         "TrainTaskAnotherSagemakerRoleBD8363A2",
+         "Arn"
+        ]
+       }
+      }
+     ],
+     "Version": "2012-10-17"
+    },
+    "PolicyName": "StateMachineAnotherRoleDefaultPolicy5D4FD497",
+    "Roles": [
+     {
+      "Ref": "StateMachineAnotherRoleB3F4936A"
+     }
+    ]
+   }
+  },
+  "StateMachineAnother9B75AA58": {
+   "Type": "AWS::StepFunctions::StateMachine",
+   "Properties": {
+    "DefinitionString": {
+     "Fn::Join": [
+      "",
+      [
+       "{\"StartAt\":\"TrainTaskAnother\",\"States\":{\"TrainTaskAnother\":{\"End\":true,\"Type\":\"Task\",\"Resource\":\"arn:",
+       {
+        "Ref": "AWS::Partition"
+       },
+       ":states:::sagemaker:createTrainingJob\",\"Parameters\":{\"TrainingJobName\":\"mytrainingjob\",\"RoleArn\":\"",
+       {
+        "Fn::GetAtt": [
+         "TrainTaskAnotherSagemakerRoleBD8363A2",
+         "Arn"
+        ]
+       },
+       "\",\"AlgorithmSpecification\":{\"TrainingInputMode\":\"FastFile\",\"AlgorithmName\":\"BlazingText\"},\"OutputDataConfig\":{\"S3OutputPath\":\"https://s3.",
+       {
+        "Ref": "AWS::Region"
+       },
+       ".",
+       {
+        "Ref": "AWS::URLSuffix"
+       },
+       "/",
+       {
+        "Ref": "TrainingData3FDB6D34"
+       },
+       "/result/\"},\"ResourceConfig\":{\"InstanceCount\":1,\"InstanceType\":\"ml.m4.xlarge\",\"VolumeSizeInGB\":10},\"StoppingCondition\":{\"MaxRuntimeInSeconds\":3600}}}}}"
+      ]
+     ]
+    },
+    "RoleArn": {
+     "Fn::GetAtt": [
+      "StateMachineAnotherRoleB3F4936A",
+      "Arn"
+     ]
+    }
+   },
+   "DependsOn": [
+    "StateMachineAnotherRoleDefaultPolicy5D4FD497",
+    "StateMachineAnotherRoleB3F4936A"
+   ],
+   "UpdateReplacePolicy": "Delete",
+   "DeletionPolicy": "Delete"
   }
  },
  "Outputs": {
   "stateMachineArn": {
    "Value": {
     "Ref": "StateMachine2E01A3A5"
    }
+  },
+  "stateMachineArn2": {
+   "Value": {
+    "Ref": "StateMachineAnother9B75AA58"
+   }
   }
  },
  "Parameters": {