[ECS] [request]: Task state change events on EventBridge not respecting DescribeTasks API

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**Tell us about your request**

From [this documentation](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ecs_cwe_events.html#ecs_task_events): `Task state change events are delivered in the following format. The detail section below resembles the **Task object that is returned from a DescribeTasks API operation** in the Amazon Elastic Container Service API Reference. If your containers are using an image hosted with Amazon ECR, the imageDigest field is returned. `

But, looking the JSON output, it doesn't have the `healthStatus` field. Please check below the event JSON for a stopped task without the `healthStatus` on it:

```
{
"version": "0",
"id": "ffa02779-64c6-efb2-5a9d-405ba9df5d81",
"detail-type": "ECS Task State Change",
"source": "aws.ecs",
"account": "ACCOUNT_ID",
"time": "2021-09-28T16:32:40Z",
"region": "eu-west-1",
"resources": [
"arn:aws:ecs:eu-west-1:ACCOUNT_ID:task/CLUSTER_NAME/caac32d0520c404a97a73c25945d1c40"
],
"detail": {
"attachments": [
{
"id": "aae56f84-9ced-4625-91c9-81501becdfda",
"type": "eni",
"status": "DELETED",
"details": [
{
"name": "subnetId",
"value": "SUBNET_ID"
},
{
"name": "networkInterfaceId",
"value": "ENI_ID"
},
{
"name": "macAddress",
"value": "0a:50:51:65:97:91"
},
{
"name": "privateDnsName",
"value": "ip-172-31-38-3.eu-west-1.compute.internal"
},
{
"name": "privateIPv4Address",
"value": "172.31.38.3"
}
]
}
],
"availabilityZone": "eu-west-1b",
"clusterArn": "arn:aws:ecs:eu-west-1:ACCOUNT_ID:cluster/CLUSTER_NAME",
"connectivity": "CONNECTED",
"connectivityAt": "2021-09-28T16:31:06.086Z",
"containers": [
{
"containerArn": "arn:aws:ecs:eu-west-1:ACCOUNT_ID:container/CLUSTER_NAME/caac32d0520c404a97a73c25945d1c40/ccb75d03-5f00-4780-bf4c-023d49ad9aa5",
"exitCode": 0,
"lastStatus": "STOPPED",
"name": "nginx-container0",
"image": "nginx",
"runtimeId": "caac32d0520c404a97a73c25945d1c40-1727258831",
"taskArn": "arn:aws:ecs:eu-west-1:ACCOUNT_ID:task/CLUSTER_NAME/caac32d0520c404a97a73c25945d1c40",
"networkInterfaces": [
{
"attachmentId": "aae56f84-9ced-4625-91c9-81501becdfda",
"privateIpv4Address": "172.31.38.3"
}
],
"cpu": "0",
"memoryReservation": "128"
}
],
"cpu": "256",
"createdAt": "2021-09-28T16:30:53.529Z",
"desiredStatus": "STOPPED",
"enableExecuteCommand": false,
"ephemeralStorage": {
"sizeInGiB": 20
},
"executionStoppedAt": "2021-09-28T16:32:17.244Z",
"group": "service:hctest",
"launchType": "FARGATE",
"lastStatus": "STOPPED",
"memory": "512",
"overrides": {
"containerOverrides": [
{
"name": "nginx-container0"
}
]
},
"platformVersion": "1.4.0",
"pullStartedAt": "2021-09-28T16:31:17.464Z",
"pullStoppedAt": "2021-09-28T16:31:22.978Z",
"startedAt": "2021-09-28T16:31:23.981Z",
"startedBy": "ecs-svc/4597613971827055402",
"stoppingAt": "2021-09-28T16:32:04.723Z",
"stoppedAt": "2021-09-28T16:32:40.003Z",
"stoppedReason": "Task failed container health checks",
"stopCode": "ServiceSchedulerInitiated",
"taskArn": "arn:aws:ecs:eu-west-1:ACCOUNT_ID:task/CLUSTER_NAME/caac32d0520c404a97a73c25945d1c40",
"taskDefinitionArn": "arn:aws:ecs:eu-west-1:ACCOUNT_ID:task-definition/nginx-fargate:10",
"updatedAt": "2021-09-28T16:32:40.003Z",
"version": 6
}
}
```

**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 receive events notifications whenever my task is stopped due to UNHEALTHY status.

**Are you currently working around this issue?**
I'd like to use this below EventBridge configuration:
```
{
"detail": {
"clusterArn": [ "arn:aws:ecs:eu-west-1:ACCOUNT_ID:cluster/CLUSTER_NAME"],
"group": ["service:SERVICE_NAME"],
"healthStatus": ["UNHEALTHY"],
"lastStatus": ["STOPPED"]
},
"detail-type": ["ECS Task State Change"],
"source": ["aws.ecs"]
}
```
Removing the `healthStatus` filter from EventBridge configuration I can receive the notification for all stopped tasks, not only the UNHEALTHY ones.

**Additional context**
Either the documentation should be updated or the JSON event should respect the [DescribeTasks API](https://docs.aws.amazon.com/AmazonECS/latest/APIReference/API_DescribeTasks.html).