Draft: Add upload error body to logs

What does this MR do and why?

Contributes to create-stage#12809 (closed)

Describe in detail what your merge request does and why.

Adds basic error logging of the body of an error response to workhorse logs. This aids in debugging issues tied to the object storage backend that aren't easily visible elsewhere.

Related https://gitlab.com/gitlab-org/gitlab/-/issues/359155

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