fix(stepfunctions): add docs and warning DistributedMap Class ignores…

… executionType in the ProcessorConfig (aws#30301)

### Issue # (if applicable)

Closes aws#30194 

### Reason for this change
In aws#27913, the ItemProcessor was introduced for use with the Map Class. With the executionType in the ProcessorConfig, it was possible to specify the executionType for the Map.
On the other hand, in aws#28821, the DistributedMap Class was introduced. The mapExecutionType of the DistributedMap class always overwrites the executionType of the ProcessorConfig.
Therefore, when using the DistributedMap class, the implementation ignores the executionType of the ProcessorConfig. However, this behavior cannot be inferred from the documentation.

### Description of changes
* Added to the docs that when using the DistributedMap Class, the executionType in the ProcessorConfig is ignored.
* Also added a warning.


### Description of how you validated changes
Add unit tests and integ tests



### 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*

packages/@aws-cdk-testing/framework-integ/test/aws-stepfunctions/test/integ.distributed-map-execution-type.js.snapshot/aws-stepfunctions-map-integ-execution-type.template.json

@@ -0,0 +1,113 @@
+{
+ "Resources": {
+  "StateMachineRoleB840431D": {
+   "Type": "AWS::IAM::Role",
+   "Properties": {
+    "AssumeRolePolicyDocument": {
+     "Statement": [
+      {
+       "Action": "sts:AssumeRole",
+       "Effect": "Allow",
+       "Principal": {
+        "Service": "states.amazonaws.com"
+       }
+      }
+     ],
+     "Version": "2012-10-17"
+    }
+   }
+  },
+  "StateMachine2E01A3A5": {
+   "Type": "AWS::StepFunctions::StateMachine",
+   "Properties": {
+    "DefinitionString": "{\"StartAt\":\"DistributedMap\",\"States\":{\"DistributedMap\":{\"Type\":\"Map\",\"End\":true,\"ItemProcessor\":{\"ProcessorConfig\":{\"Mode\":\"DISTRIBUTED\",\"ExecutionType\":\"EXPRESS\"},\"StartAt\":\"Pass\",\"States\":{\"Pass\":{\"Type\":\"Pass\",\"End\":true}}}}}}",
+    "RoleArn": {
+     "Fn::GetAtt": [
+      "StateMachineRoleB840431D",
+      "Arn"
+     ]
+    }
+   },
+   "DependsOn": [
+    "StateMachineRoleB840431D"
+   ],
+   "UpdateReplacePolicy": "Delete",
+   "DeletionPolicy": "Delete"
+  },
+  "StateMachineDistributedMapPolicy57C9D8C2": {
+   "Type": "AWS::IAM::Policy",
+   "Properties": {
+    "PolicyDocument": {
+     "Statement": [
+      {
+       "Action": "states:StartExecution",
+       "Effect": "Allow",
+       "Resource": {
+        "Ref": "StateMachine2E01A3A5"
+       }
+      },
+      {
+       "Action": [
+        "states:DescribeExecution",
+        "states:StopExecution"
+       ],
+       "Effect": "Allow",
+       "Resource": {
+        "Fn::Join": [
+         "",
+         [
+          {
+           "Ref": "StateMachine2E01A3A5"
+          },
+          ":*"
+         ]
+        ]
+       }
+      }
+     ],
+     "Version": "2012-10-17"
+    },
+    "PolicyName": "StateMachineDistributedMapPolicy57C9D8C2",
+    "Roles": [
+     {
+      "Ref": "StateMachineRoleB840431D"
+     }
+    ]
+   }
+  }
+ },
+ "Parameters": {
+  "BootstrapVersion": {
+   "Type": "AWS::SSM::Parameter::Value<String>",
+   "Default": "/cdk-bootstrap/hnb659fds/version",
+   "Description": "Version of the CDK Bootstrap resources in this environment, automatically retrieved from SSM Parameter Store. [cdk:skip]"
+  }
+ },
+ "Rules": {
+  "CheckBootstrapVersion": {
+   "Assertions": [
+    {
+     "Assert": {
+      "Fn::Not": [
+       {
+        "Fn::Contains": [
+         [
+          "1",
+          "2",
+          "3",
+          "4",
+          "5"
+         ],
+         {
+          "Ref": "BootstrapVersion"
+         }
+        ]
+       }
+      ]
+     },
+     "AssertDescription": "CDK bootstrap stack version 6 required. Please run 'cdk bootstrap' with a recent version of the CDK CLI."
+    }
+   ]
+  }
+ }
+}