NetworkPolicy applicable pod request does not scale with `notin` ns matchExpression

[richard-cox]

Setup

• Rancher version: v2.12

Describe the bug

• We show applicable pods for ingress/egress rule pod selectors
• When Namespace/Pod Label Selector is used we don't search for namespaces in a performant way
• When NOTIN is selected we find all ns not matching results and then search pods for ones with them in
• When vai is enabled we should just use the ns matchExpression in conjunction with the pod matchExpression
• Troublesome line - https://github.com/rancher/dashboard/blob/master/shell/edit/networking.k8s.io.networkpolicy/PolicyRuleTarget.vue#L216

To Reproduce

• cluster --> Policy --> Network Policies --> Create --> Ingress Rules --> Configure --> + Add allowed traffic target --> Rule type --> Namespace/Pod Label Selector
• enter a key for namespace, change namespace operator to not in list

Result

• see the resulting large http request

Expected Result

• the ns should e filtered on metdata.name notint (user string)

Additional context

• Reduce the url length of requests used to support lists #16031