WIP: OCPNODE-4123: Add NetworkPolicy manifests for DAS operator

[harche]

Summary

• Add default-deny and allow NetworkPolicy resources to the das-operator namespace per OCPSTRAT-2061 / OCPSTRAT-819 requirements
• Addresses CIS Kubernetes Benchmark 5.3.2 ("Ensure that all Namespaces have Network Policies defined") and Red Hat ProdSec guidance
• Follows the same pattern used by kueue-operator and cluster-node-tuning-operator

Changes

New network policy manifests (bindata/assets/instaslice-operator/networkpolicy/):

• 99-deny-all.yaml — Default deny all ingress and egress for all pods in the namespace
• 10-allow-egress-api.yaml — Allow all DAS pods egress to kube-apiserver on port 6443
• 10-allow-egress-cluster-dns.yaml — Allow all DAS pods egress to openshift-dns for name resolution
• 10-allow-ingress-webhook.yaml — Allow ingress to webhook pods on port 8443 (admission webhook calls)

New helper (pkg/util/resourceapply/networking.go):

• ReadNetworkPolicyV1OrDie() and ApplyNetworkPolicy() — ported from kueue-operator since library-go doesn't have NetworkPolicy apply support yet

Modified reconciler (pkg/operator/target_config_reconciler.go):

• Added manageNetworkPolicies() function called during sync()
• Added NetworkPolicies informer for reconciliation

Modified bindata (bindata/assets.go):

• Added AssetDir() function to iterate over files in a directory

Jira

• Feature: OCPSTRAT-2061
• Epic: OCPNODE-3986
• Story: OCPNODE-4123

Test plan

• Verify operator builds and starts successfully
• Verify all 4 NetworkPolicy resources are created in the das-operator namespace
• Verify webhook still receives admission requests with policies active
• Verify scheduler can still schedule GPU workloads
• Verify daemonset can still communicate with API server
• Verify policy reconciliation (delete a policy, verify it is recreated)

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