Handle upload/LFS object/artifact delete failures properly -- Follow-up from "Add Geo support for CI job artifacts"

The following discussion from !3935 (merged) should be addressed:

• @stanhu started a discussion: (+7 comments)

  Ah, interesting. Let's say we have a permission error in the path, and we have a ton of failed deletes. What happens now? Are we left with events that have already been processed but left in the registry?