fix(integ-tests): apply correct IAM policy to waiterProvider (#28424)

### Description
The following issue describes a bug where the IAM Policy is not correctly set to the calling Lambda when using `invokeFunction` and `waitForAssertions`.

Normally, when the `waitForAssertions` method is invoked, the necessary Policy is granted to the `waiterProvider` using the `adPolicyStatementFromSdkCall` method.
https://github.com/aws/aws-cdk/blob/52a5579aa52c88bb289a7a9677c35385763c8fff/packages/%40aws-cdk/integ-tests-alpha/lib/assertions/sdk.ts#L136

In the case of a Lambda function call, the API name and the Action name of the Policy are different (invoke => invokeFunction), so the `addPolicyStatementFromSdkCall` method cannot grant the correct Policy.
The `LambdaInvokeFunction` is doing the correct Policy assignment to deal with this in the constructor.
https://github.com/aws/aws-cdk/blob/52a5579aa52c88bb289a7a9677c35385763c8fff/packages/%40aws-cdk/integ-tests-alpha/lib/assertions/sdk.ts#L247

However, this is not done for the `waiterProvider`, resulting in an access denied error.
This PR has been modified so that the correct Policy is granted to `waiterProvider`.

fixes #27865

----

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

packages/@aws-cdk/integ-tests-alpha/lib/assertions/sdk.ts

@@ -214,7 +214,7 @@ export interface LambdaInvokeFunctionProps {
 
 /**
  * An AWS Lambda Invoke function API call.
- * Use this istead of the generic AwsApiCall in order to
+ * Use this instead of the generic AwsApiCall in order to
  * invoke a lambda function. This will automatically create
  * the correct permissions to invoke the function
  */
@@ -250,6 +250,20 @@ export class LambdaInvokeFunction extends AwsApiCall {
       arnFormat: ArnFormat.COLON_RESOURCE_NAME,
       resourceName: props.functionName,
     })]);
+
+    // If using `waitForAssertions`, do the same for `waiterProvider` as above.
+    // Aspects are used here because we do not know if the user is using `waitForAssertions` at this point.
+    Aspects.of(this).add({
+      visit(node: IConstruct) {
+        if (node instanceof AwsApiCall && node.waiterProvider) {
+          node.waiterProvider.addPolicyStatementFromSdkCall('Lambda', 'invokeFunction', [stack.formatArn({
+            service: 'lambda',
+            resource: 'function',
+            arnFormat: ArnFormat.COLON_RESOURCE_NAME,
+            resourceName: props.functionName,
+          })]);
+        }
+      },
+    });
   }
 }
-