Ensure `ResourceClosed` is emitted at most once for every resource

[johny-b]

ResourceClosed means "nothing can be done to this resource ever again", so repeated ResourceClosed should never happen.

Currently this happens for Activity. I consider this to be an unusual yagna design decision - we send a DELETE, in my world repeated DELETE to the same endpoint should return 404 (assuming there was no PUT, to be exact) - and yet we always get 200, even for DELETEd Activities.

To replicate just have await activity.destroy() multiple times for the same activity.