(appmesh): virtual node validation doesn't catch adding more than one listener to a node

[misterjoshua]

The VirtualNode construct allows you to add more than one listener, but CloudFormation doesn't support more than one listener at a time. (CFN Docs)

Reproduction Steps

Add more than one listener to a Virtual Node and try to deploy.

new appmesh.VirtualNode(stack, 'VirtualNode', {
  mesh: appmesh.Mesh.fromMeshName(stack, 'Mesh', meshName),
  listeners: [
    appmesh.VirtualNodeListener.http(),
    appmesh.VirtualNodeListener.grpc(),
  ],
});

What did you expect to happen?

VirtualNode should throw an error when it detects my attempt to add a second listener.

What actually happened?

It successfully synthesized but failed to deploy a stack.

Environment

• CDK CLI Version : 1.93.0
• Framework Version: 1.93.0
• Node.js Version: v14.15.1
• OS : Linux
• Language (Version): all

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This is 🐛 Bug Report

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