[ECS] [request]: extend ECS Deployment State Change Event

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**Tell us about your request**
What do you want us to build?

ECS Deployment State has little information.
Please add more information (ex: Cluster name and Service name) to event .

**Which service(s) is this request for?**
ECS
EventBridge
Chatbot

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
What outcome are you trying to achieve, ultimately, and why is it hard/impossible to do right now? What is the impact of not having this problem solved? The more details you can provide, the better we'll be able to understand and solve the problem.

I'm integrating ECS+EventBridge+Chatbot for notify deployment event to Slack.
But, this notification has litter information.

like this.

---
:mega: ECS Deployment State Change | ap-northeast-1 | Account: XXXXX
ECS deployment ecs-svc/3172XXXXXX in progress.
Deployment ID ecs-svc/3172XXXXXX
Event type INFO
Event name SERVICE_DEPLOYMENT_IN_PROGRESS
Updated at Thu, 13 May 2021 08:30:17 GMT
---

This information does not tell you which services in which cluster are deployed.

Please extend the event metadata.
https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ecs_cwe_events.html

**Are you currently working around this issue?**
How are you currently solving this problem?
no.

Start with the ECS deployment state change event documentation linked in the issue and review the current event metadata. Determine how cluster and service names should be represented, then verify that the resulting event provides enough information to identify the deployed service and cluster in EventBridge and Chatbot notifications.

Written by the indexing model from the issue text.