In GitLab 13.1.0, we added an S3 client to Workhorse
(https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/466).
Previously this client would only be enabled if AWS instance profiles
(use_iam_profile) were used. We extend this functionality if the
consolidated object storage settings are enabled for AWS.

This will fix ETag Mismatch errors with non-AWS S3 providers and pave
the way for supporting encrypted S3 buckets with customer-provided keys.

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/220288