[OVN-IC] High memory usage by ovnkube-network-controller-manager in OVN-IC

We are running node-density-heavy workload on a 120 node OVN-IC environment. OVN components are using 3.22 GiB memory in each worker node in OVN-IC. In that, ovnkube-network-controller-manager is using 1.75 GiB. ovnkube-master is using 0.674 GiB in master node in classis OVN for the same workload. ovnkube-ncm has to be improved to use lesser memory as it is handling only local pods, which will help in reducing overall memory usage by OVN components in the worker node (i.e bringing down 3.22 GiB usage).Please check https://docs.google.com/document/d/1t5pLoICUFsYo_7EMJ1tZk4tTxavUqRaKFjlEzIhwBnQ/edit?usp=sharing for more details

OCP 4.14
OVN image: quay.io/itssurya/dev-images:ic-scale-v0
CNO image: quay.io/itssurya/dev-images:ic-cno-hack

1. Deploy 120 node OCP environment on AWS
2. Apply OVN builds
3. Run node-denisty-heavy workload