[cherry-pick] Use pod labels as headless selector labels (#7654)

Use pod labels as headless selector labels (#7651)

Co-authored-by: Paul Abel <[email protected]>

Author: nginx-bot

charts/nginx-ingress/templates/_helpers.tpl

@@ -58,7 +58,6 @@ helm.sh/chart: {{ include "nginx-ingress.chart" . }}
 app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
 {{- end }}
 app.kubernetes.io/managed-by: {{ .Release.Service }}
-zone-sync.nginx.com/name: {{ .Chart.Name }}
 {{- end }}
 
 {{/*
@@ -87,7 +86,6 @@ Selector labels
 {{ toYaml .Values.controller.selectorLabels }}
 {{- else -}}
 app.kubernetes.io/name: {{ include "nginx-ingress.name" . }}
-zone-sync.nginx.com/name: {{ include "nginx-ingress.name" . }}
 app.kubernetes.io/instance: {{ .Release.Name }}
 {{- end -}}
 {{- end -}}