Add a new metric/event/status when egress firewall objects can't be reconciled due to nameserver errors

In OCPBUGS-11855, we discussed of a desire to surface any issues with nameservers in the status field of egress firewall/metric/event so that we can improve the operability of the SD fleet. We decided to not implement this for openshift-sdn, but absolutely are committed to do this for OVN. This card is to track the work required to implement the gaps identified in the bug including potentially parallelizing the egress firewall dns querying as a part of bring up of the control plane.