aws-ecs-patterns: support built-in blue/green deployments

### Describe the feature

Amazon ECS now supports built-in blue/green deployments.
https://aws.amazon.com/about-aws/whats-new/2025/07/amazon-ecs-built-in-blue-green-deployments/

[Support was recently added to the aws-ecs module.](https://github.com/aws/aws-cdk/pull/35061)

It would be great to have support added to the [aws-ecs-patterns](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_ecs_patterns-readme.html) module also, so constructs such as `ApplicationLoadBalancedFargateService` can benefit from the feature.

### Use Case

To allow uses of `aws-ecs-patterns`, such as `ApplicationLoadBalancedFargateService`, to make use of blue/green deployments.

### Proposed Solution

Add properties for built-in blue/green deployments.

### Other Information

_No response_

### Acknowledgements

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

### AWS CDK Library version (aws-cdk-lib)

all

### AWS CDK CLI version

all

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

all

Start with the aws-ecs-patterns module and the ApplicationLoadBalancedFargateService construct, then compare its integration points with the recently updated aws-ecs module in PR 35061. Review the AWS ECS built-in blue/green deployment documentation and identify the properties required for the pattern constructs; done means those constructs can configure and use the feature.

Written by the indexing model from the issue text.