chore(elasticloadbalancingv2): fix NLB attributes integ test

[badmintoncryer]

Issue # (if applicable)

Closes #29970.

Reason for this change

Existing integ test (integ.nlb-attributes.ts) fails to deploy because denyAllIgwTraffic is not configurable for IPV4 load balancer.

new elbv2.NetworkLoadBalancer(stack, 'NLB', {
  vpc,
  denyAllIgwTraffic: true, // This parameter is not configurable for IPV4 loadbalancer
});

Description of changes

• Remove the denyAllIgwTraffic setting from integ.nlb-attribute.ts
• Instead, set denyAllIgwTraffic in integ.nlb.dualstack.internal.ts.

Description of how you validated changes

I've updated integ tests

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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

[aws-cdk-automation]

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• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 4616172
• Result: SUCCEEDED
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