[ECS] [request]: include cluster ARN in ECS service deployment state change events

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**Tell us about your request**

Include Cluster ARN in [ECS service deployment state change events](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ecs_cwe_events.html#ecs_service_deployment_events)

**Which service(s) is this request for?**

ECS

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**

I'd like to react to service deployment events on specific clusters, but I can't create a rule for a specific cluster.

**Are you currently working around this issue?**

I need to accept events from all clusters and filter it using custom code in my event target.

**Additional context**

[ECS service action events](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ecs_cwe_events.html#ecs_service_events) _do_ include a `["detail"]["clusterArn"]` key which can be used for filtering. It would be great to have that on the deploy events as well.