Enable managed draining for autoscaling_capacity_providers in ecs cluster

[purplepangolin]

Is your request related to a new offering from AWS?

Amazon recently announced managed instance draining

a new capability that facilitates graceful shutdown of workloads deployed on Amazon Elastic Compute Cloud (Amazon EC2) instances by safely stopping and rescheduling workloads to other, non-terminating instances.

Is this functionality available in the AWS provider for Terraform?

• Yes ✅:
  Support for this was added to the terraform aws provider in release v5.34.0 and its use is documented here.

Is your request related to a problem? Please describe.

This feature is available by setting the managed_draining property on aws_ecs_capacity_provider but is not exposed in auto_scaling_group_provider

Describe the solution you'd like.

Amend the implementation of how variable "autoscaling_capacity_providers" gets passed down to this block to propagate the managed_draining setting in the same way as is done for managed_termination_protection. This will need to be gated so that it is only set for aws provider 5.34.0 and above.

Describe alternatives you've considered.

Additional context

[easterbonbon]

Hey there, it sounds like the changes coming up in v6 may address your issue here. Here's the relevant PR: #158

[purplepangolin]

Thanks @easterbonbon, was just about to open a pr for that myself as I hadn't spotted that one.

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