Describe the bug

When I do Vpc.fromLookup in a VPC that has subnets with a default route to a TransitGateway the subnet is detected as PRIVATE_ISOLATED instead of PRIVATE_WITH_EGRESS

This PR that introduced it talks about TransitGateway too but it doesn't seem to get applied.

Expected Behavior

Detect subnet with a default route to a TransitGateway as PRIVATE_WITH_EGRESS

Current Behavior

Subnets with a default route to a TransitGateway are detected as PRIVATE_ISOLATED

Reproduction Steps

Use Vpc.fromLookup in a VPC that has subnets with a default route to a TransitGateway

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.66

Framework Version

No response

Node.js Version

16.16

OS

MacOS

Language

Typescript

Language Version

No response

Other information

No response