How to handle proxying FindRemoteRepository
It is a first steps towards making FindRemoteRepository RPC to become STORAGE scoped. It is needed to simplify routing in Praefect and omit need for Praefect to handle this RPC as a special case. After change is done the request will be routed into one of the Gitalies and handled there. The Git is not needed to be installed on Prafect node in order to support the implementation of only single RPC.
Part of: #2442 (closed)