…k NLB (aws#32184)

### Issue # (if applicable)

None

### Reason for this change

NetworkListener has the validation that it does not create UDP listeners for dual-stack NLB.

However, dual-stack NLB now supports the creation of UDP listeners, and this validation is no longer required.

<https://aws.amazon.com/about-aws/whats-new/2024/10/aws-udp-privatelink-dual-stack-network-load-balancers/?nc1=h_ls>

### Description of changes

- Remove this validation from NetworkListener class.

```ts
    if (
      props.loadBalancer.ipAddressType === IpAddressType.DUAL_STACK &&
      (props.protocol === Protocol.UDP || props.protocol === Protocol.TCP_UDP)
    ) {
      throw new Error('UDP or TCP_UDP listeners cannot be added to a dualstack network load balancer.');
    }
```

- Add `enablePrefixIpv6SourceNat` to the `NetworkLoadbalancerProps`
  - It is essential to enable this parameter for UDP listener with dual-stack NLB.
  - ref: aws#32184 (comment)

### Description of how you validated changes

Add both unit 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)

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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*