Oracle Cloud Object Storage as an Artifact Repository

# Summary

Enhance the Artifact Repository to support Oracle Cloud Object Storage as a backend.

## Use Cases

Users of Oracle Cloud may use OCI Object Storage as part of their Argo CD Worklows.

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**Message from the maintainers**:

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Start by locating the Artifact Repository implementation and its configuration entry points, then trace how Argo CD Workflows select an artifact backend. Done means OCI Object Storage can be configured and used for artifacts in a workflow; the issue names no files or tests, so substantial repository exploration is required.

Written by the indexing model from the issue text.