The goal of this epic is to come up with a design that allows to change ovn-kubernetes transit subnet with zero service downtime.

The 100.88.0.0/14 IPv4 subnet is currently reserved for the transit switch in OVN-Kubernetes for east west traffic in the OVN Interconnect architecture. We need to make this value configurable so that users can avoid conflicts with their local infrastructure.  We need to support this config both prior to installation and post installation (day 2).

This epic will include stories for the upstream ovn-org work, getting that work downstream, an api change, and a cno change to consume the new api