Cherry-pick performance fix in kube-router

[manuelbuil]

Environmental Info:
K3s Version:

Node(s) CPU architecture, OS, and Version:

Cluster Configuration:

Describe the bug:

There is a performance issue on the network policy controller which makes pod creation very slow when there are a lot of network policies. More information: #8321

We must cherry-pick the fix created in the upstream kube-router

Steps To Reproduce:

• Installed K3s:

Expected behavior:

Actual behavior:

Additional context / logs:

[aganesh-suse]

Closing this - since the update router issues have been verified/closed.