Consolidate error reporting in uploader.go
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=324865) </details> <!--IssueSummary end--> 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.
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