[Nutanix EgressIP] The egressIP was not removed from nutanix nic after deleting egressIP object

After run egressIP automation cases, found many IPs left for nutanix nic, then manually reproduced that egressIP was not removed from nutanix nic after deleting egressIP objects 

4.14.0-0.nightly-2023-05-19-234822 

Always

1. Label one node as egress node
% oc label node  huirwang-0522a-qx4w4-master-2    k8s.ovn.org/egress-assignable=    
node/huirwang-0522a-qx4w4-master-2 labeled

10. Create egressIP object  and create namespace
% oc get egressip
NAME         EGRESSIPS     ASSIGNED NODE                   ASSIGNED EGRESSIPS
egressip-1   10.0.132.80   huirwang-0522a-qx4w4-master-2   10.0.132.80

 % oc create ns test
namespace/test created

% oc create -f ../data/4.12/ping-pod.yaml -n test
pod/hello-pod created
Before add label to namespace test, check the node huirwang-0522a-qx4w4-master-2, egressIP was not there.
[
  {
    "nic_type": "NORMAL_NIC",
    "uuid": "395748c3-d5fe-4c3b-8da4-a482c40fc12b",
    "ip_endpoint_list": [
      {
        "ip": "10.0.132.235",
        "type": "ASSIGNED"
      }
    ],
    "vlan_mode": "ACCESS",
    "mac_address": "50:6b:8d:ec:fd:69",
    "subnet_reference": {
      "kind": "subnet",
      "name": "uvm_network2",
      "uuid": "efe26e93-f6cf-4d89-8104-009e85201fa8"
    },
    "is_connected": true,
    "trunked_vlan_list": []
  }
]

Add label to namespace test
 % oc label ns test name=qe
namespace/test labeled

 Check node huirwang-0522a-qx4w4-master-2
[
  {
    "nic_type": "NORMAL_NIC",
    "uuid": "395748c3-d5fe-4c3b-8da4-a482c40fc12b",
    "ip_endpoint_list": [
      {
        "ip": "10.0.132.235",
        "type": "ASSIGNED"
      },
      {
        "ip": "10.0.132.80",
        "type": "LEARNED"
      }
    ],
    "vlan_mode": "ACCESS",
    "mac_address": "50:6b:8d:ec:fd:69",
    "subnet_reference": {
      "kind": "subnet",
      "name": "uvm_network2",
      "uuid": "efe26e93-f6cf-4d89-8104-009e85201fa8"
    },
    "is_connected": true,
    "trunked_vlan_list": []
  }
]

Delete egressIP object and namespace test
% oc get egressip
No resources found
 % oc get ns test
Error from server (NotFound): namespaces "test" not found

Checked node huirwang-0522a-qx4w4-master-2 nic again

EgressIP was not removed
[
  {
    "nic_type": "NORMAL_NIC",
    "uuid": "395748c3-d5fe-4c3b-8da4-a482c40fc12b",
    "ip_endpoint_list": [
      {
        "ip": "10.0.132.235",
        "type": "ASSIGNED"
      },
      {
        "ip": "10.0.132.80",
        "type": "LEARNED"
      }
    ],
    "vlan_mode": "ACCESS",
    "mac_address": "50:6b:8d:ec:fd:69",
    "subnet_reference": {
      "kind": "subnet",
      "name": "uvm_network2",
      "uuid": "efe26e93-f6cf-4d89-8104-009e85201fa8"
    },
    "is_connected": true,
    "trunked_vlan_list": []
  }
]

EgressIP should be removed from VM  NIC.