Delete stack from state

[project0]

Hello!

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Issue details

I am using the s3 backend and noticed that states are not entirely cleaned up after deleting a stack:

The resources in the stack have been deleted, but the history and configuration associated with the stack are still maintained.
If you want to remove the stack completely, run pulumi stack rm main-flowers-dev-environments-shared.

It would be great to have an option to trigger the stack deletion as part of the operator. I am using it to create ephemeral environments and it results into a lot of "empty" states in my s3 bucket :-(.

Affected area/feature

[EronWright]

It is a reasonable request, and I suppose this would best be done via a new "stack retention policy" flag.