aws_autoscaling_group - throw an error when you define a tag twice

[ghost]

This issue was originally opened by @jjshoe as hashicorp/terraform#2270. It was migrated here as a result of the provider split. The original body of the issue is below.

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https://www.terraform.io/docs/providers/aws/r/autoscaling_group.html

If you do a tag twice, and tell it to propagate in one, and not the other, you get random results in how the group is actually made. Should probably detect and error on this

[apparentlymart]

This was held over in the core repository originally because there was no way to validate this at the time. Now that we have CustomizeDiff, which can serve as a validation mechanism, I sent this over here to see if you'd like to address it using that mechanism.

[github-actions]

Marking this issue as stale due to inactivity. This helps our maintainers find and focus on the active issues. If this issue receives no comments in the next 30 days it will automatically be closed. Maintainers can also remove the stale label.

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[jjshoe]

bump

[github-actions]

Marking this issue as stale due to inactivity. This helps our maintainers find and focus on the active issues. If this issue receives no comments in the next 30 days it will automatically be closed. Maintainers can also remove the stale label.

If this issue was automatically closed and you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thank you!

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.