Description of problem:
Each time the ovn-master change by a new election, the egressfirewall rules are written again in the OVN Northbound database. So, the egressfirewall rules grow indefinitely in the NBDB and we notice some problems with the priority rules appear.

Version-Release number of selected component (if applicable):
UPI Baremetal OCP 4.9.37 and 4.9.46

How reproducible:
Every time

Steps to Reproduce:
1. create an egressfirewall on the namespace
2. restart the ovnkube-master active pod
3. check the nbdb for duplicate egressfirewall rules

Actual results:
duplicate entries and priorities changed for the rules

Expected results:
there shouldn't be any duplicate entries

Additional info: