In Diffusion, split service URI resolution from conduit client construction
Summary:
Ref T7019. Ref T7034. In both proxying cases, we want to proxy the request but can not do so over Conduit.
Split the URI resolution apart from Conduit client construction so we can just pull an SSH or HTTP/S URI out of the repository without getting an entire Conduit client.
Test Plan: Browsed around a service-hosted repository. This diff has no behavioral changes.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T7034, T7019
Differential Revision: https://secure.phabricator.com/D11491