W29: Whitelabel AWS CDK generated block egress rule

[Poweranimal]

Hi,

The AWS CDK generates the following block all egress rule for SecurityGroups:

...
"SecurityGroupEgress": [
  {
    "CidrIp": "255.255.255.255/32",
    "Description": "Disallow all traffic",
    "FromPort": 252,
    "IpProtocol": "tcp",
    "ToPort": 86
  }
]
...

The rational for this rule can be found here: https://github.com/aws/aws-cdk/blob/9975ec8ba98fcef7156148d9af79adfdb171514a/packages/%40aws-cdk/aws-ec2/lib/security-group.ts#L621

Though, the generated egress rule fails the W29 (= Security Groups found egress with port range instead of just a single port).

I would suggest to whitelabel this rule for W29.