Previously if S3 server side encryption were required to store CI
artifacts via a bucket policy, the final migration to object storage
would fail, leaving the job log unmigrated.

To fix this, we need to send the right headers
(e.g. `x-amz-server-side-encryption`) to the object storage backend via
Fog.

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/273498