Allow object store settings to be set for artifacts

Zeger-Jan van de Wegrequested to merge
zj-object-store-config into master

For EEP, we now allow object storage to be used to store artifacts, with this commit the settings can be set.

EE MR: gitlab-org/gitlab-ee!1762

Fixes #2178 (closed)

Edited by GitLab Release Tools Bot

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