fix(ecs): Scope-down IAM permissions for ECS drain

[ddneilson]

Fixes #9501

Testing

This was tested by deploying a simple app that was basically the sample from the ECS module readme, and then manually killing off instances from the ECS cluster's ASG. When I killed off an instance I then verified, from the lambda logs, that the task-draining lambda was able to complete its work with no errors.

The essentials of the app are:

const app = new cdk.App();

const env = {
    account: process.env.CDK_DEFAULT_ACCOUNT,
    region: process.env.CDK_DEFAULT_REGION
}

const stack = new cdk.Stack(app, 'Testing', { env });
const vpc = new ec2.Vpc(stack, 'Vpc');

// Create an ECS cluster
const cluster = new ecs.Cluster(stack, 'Cluster', {
  vpc,
});

// Add capacity to it
cluster.addCapacity('DefaultAutoScalingGroupCapacity', {
  instanceType: new ec2.InstanceType("t2.xlarge"),
  desiredCapacity: 2,
});

const taskDefinition = new ecs.Ec2TaskDefinition(stack, 'TaskDef');

taskDefinition.addContainer('DefaultContainer', {
  image: ecs.ContainerImage.fromRegistry("amazon/amazon-ecs-sample"),
  memoryLimitMiB: 512,
  logging: ecs.LogDriver.awsLogs({
    logGroup: new logs.LogGroup(stack, 'LogGroup', {
      logGroupName: '/test-group/',
      removalPolicy: cdk.RemovalPolicy.DESTROY,
      retention: logs.RetentionDays.ONE_DAY,
    }),
    streamPrefix: 'testing-',
  }),
});

// Instantiate an Amazon ECS Service
const ecsService = new ecs.Ec2Service(stack, 'Service', {
  cluster,
  taskDefinition,
  desiredCount: 2,
});

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[iamhopaul123]

Ship it 💯

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