(aws-ecs): vpc networking not possible with windows clusters

### Describe the feature

[docs.aws.amazon.com/AmazonECS/latest/developerguide/bootstrap_windows_container_instance.html](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/bootstrap_windows_container_instance.html)

In order to enable vpc networking on windows clusters `-EnableTaskENI` needs to be added to the `Initialize-ECSAgent` command that is run as part of the user data.

The line in the user data of the launch configuration needs to look like so

Initialize-ECSAgent -Cluster 'xxxxx' -EnableTaskIAMRole -EnableTaskENI

### Use Case

atm, can't use vpc networking with this flag

### Proposed Solution

_No response_

### Other Information

_No response_

### Acknowledgements

- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### CDK version used

latest

### Environment details (OS name and version, etc.)

2019 full

Search the AWS CDK repository for the Windows user-data generation and the Initialize-ECSAgent command used by launch configurations. Confirm how the generated command is tested, then ensure Windows cluster user data includes -EnableTaskENI and verify the rendered user data for Windows 2019.

Written by the indexing model from the issue text.