Consolidate error reporting in uploader.go

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Right now when an upload strategy encounters an error in Upload() (example: https://gitlab.com/gitlab-org/gitlab-workhorse/blob/cd687bb1ac52798b9f168206d9483153f2028f24/internal/objectstore/s3_object.go#L51) or Delete(), the strategy may log the error, but this should probably done by the uploader itself.