chore(ecs): add integ test for ECS with Windows use case (#31545)

### Issue # (if applicable)

None

### Reason for this change

Adding an integ test of using ECS with Windows AMIs. This is currently missing, hence, is a test gap.

### Description of changes

The integ test creates an ECS cluster and a Ec2Service that lives in EC2 instances.

### Description of how you validated changes

N/A

### 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*

Author: samson-keung