feat: using LeaseLock for election (#8921)

We removed the use of configmap as an election lock, so we will use the
Lease API to complete the election.

Before this, we used `MultiLock` to facilitate smooth migration of
existing users of ingress-nginx from configmap to LeaseLock.

Signed-off-by: Jintao Zhang <zhangjintao9020@gmail.com>

Signed-off-by: Jintao Zhang <zhangjintao9020@gmail.com>

charts/ingress-nginx/templates/controller-role.yaml

@@ -58,21 +58,6 @@ rules:
       - get
       - list
       - watch
-  - apiGroups:
-      - ""
-    resources:
-      - configmaps
-    resourceNames:
-      - {{ .Values.controller.electionID }}
-    verbs:
-      - get
-      - update
-  - apiGroups:
-      - ""
-    resources:
-      - configmaps
-    verbs:
-      - create
   - apiGroups:
       - coordination.k8s.io
     resources: