feat(stepfunctions): add stateMachineRevisionId property to StateMachine (#26443)

Expose `stateMachineRevisionId` as a readonly property to StateMachine whose value is a reference to the `StateMachineRevisionId` attribute of the underlying CloudFormation resource.

Closes #26440

----

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

Author: wong-a

packages/aws-cdk-lib/aws-stepfunctions/lib/state-machine.ts

@@ -407,6 +407,12 @@ export class StateMachine extends StateMachineBase {
    */
   public readonly stateMachineType: StateMachineType;
 
+  /**
+   * Identifier for the state machine revision, which is an immutable, read-only snapshot of a state machine’s definition and configuration.
+   * @attribute
+   */
+  public readonly stateMachineRevisionId: string;
+
   constructor(scope: Construct, id: string, props: StateMachineProps) {
     super(scope, id, {
       physicalName: props.stateMachineName,
@@ -451,6 +457,7 @@ export class StateMachine extends StateMachineBase {
       resourceName: this.physicalName,
       arnFormat: ArnFormat.COLON_RESOURCE_NAME,
     });
+    this.stateMachineRevisionId = resource.attrStateMachineRevisionId;
   }
 
   /**

packages/aws-cdk-lib/aws-stepfunctions/test/state-machine.test.ts

@@ -579,4 +579,26 @@ describe('State Machine', () => {
       DeletionPolicy: 'Retain',
     });
   });
+
+  test('stateMachineRevisionId property uses attribute reference', () => {
+    // GIVEN
+    const stack = new cdk.Stack();
+
+    // WHEN
+    const stateMachine = new sfn.StateMachine(stack, 'MyStateMachine', {
+      stateMachineName: 'MyStateMachine',
+      definitionBody: sfn.DefinitionBody.fromChainable(new sfn.Pass(stack, 'Pass')),
+    });
+
+    new sfn.CfnStateMachineVersion(stack, 'MyStateMachineVersion', {
+      stateMachineRevisionId: stateMachine.stateMachineRevisionId,
+      stateMachineArn: stateMachine.stateMachineArn,
+    });
+
+    // THEN
+    Template.fromStack(stack).hasResourceProperties('AWS::StepFunctions::StateMachineVersion', {
+      StateMachineArn: { Ref: 'MyStateMachine6C968CA5' },
+      StateMachineRevisionId: { 'Fn::GetAtt': ['MyStateMachine6C968CA5', 'StateMachineRevisionId'] },
+    });
+  });
 });