feat: mdawn ecs policy gov compatibility

[mdawn]

Description

RIght now, the default partition is hard-coded to aws, this leverages the data source aws_partition https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/partition allowing this module to support GovCloud out of the box.

Thanks to @esacteksab for the original inspo to make it compatible.

Motivation and Context

The module out of the box does not support GovCloud. This allows it to.

Breaking Changes

None that I'm aware of.

How Has This Been Tested?

• I have tested and validated these changes using one or more of the provided examples/* projects
  Made this change on a local branch and ran it against our GovCloud instance. I see no reason why this would impact anything else.

[antonbabenko]

Hi,

I believe you can just override policies_arn argument with the list of ARNs you have in GovCloud or any other part of AWS (eg, China).

policies_arn = ["arn:aws-us-gov:iam::aws:policy/service-role/AmazonECSTaskExecutionRolePolicy"]

There is no need for this pull request.

[github-actions]

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