data sources hcp_packer_{image,iteration} should have a flag to error if latest image is revoked

[drewmullen]

Description

There should be a virtual attribute to cause an error from the data source if an image has revoked != nil.

There could also be another virtual attribute to find the latest that is not revoked, which is probably more useful

New or Affected Resource(s)

• hcp_packer_iteration
• hcp_packer_image

Potential Terraform Configuration

data "hcp_packer_image" "ubuntu_us_east_2" {
  bucket_name    = "learn-packer-ubuntu"
  cloud_provider = "aws"
  iteration_id   = var.iteration_id
  region         = "us-east-2"

  reject_revoked_latest = true
}

If yall are open to this idea I'm happy to work on a PR