test: Only synth once

An update in AWS CDK v2.165.0 mean we can only synth a stack once.

See:
  - https://github.com/aws/aws-cdk/releases/tag/v2.165.0
  - aws/aws-cdk#31865

src/constructs/iam/policies/anghammarad.test.ts

@@ -17,7 +17,6 @@ describe("GuAnghammaradSenderPolicy", () => {
 
     // explicitly add an AnghammaradTopicParameter
     GuAnghammaradTopicParameter.getInstance(stack);
-    Template.fromStack(stack).hasParameter("AnghammaradSnsArn", {});
 
     // add the policy
     attachPolicyToTestRole(stack, GuAnghammaradSenderPolicy.getInstance(stack));