Add peer auth policy for mtls

Fixes https://repo1.dso.mil/platform-one/big-bang/bigbang/-/issues/1043

chart/templates/bigbang/minio-operator-exception.yaml

+{{- if .Values.istio.enabled }}
+apiVersion: "security.istio.io/v1beta1"
+kind: PeerAuthentication
+metadata:
+  name: minio-operator-exception
+  namespace: {{ .Release.Namespace }}
+spec:
+  mtls:
+    mode: {{ .Values.istio.mtls.mode }}
+  selector:
+    matchLabels:
+      {{- include "minio-operator.selectorLabels" . | nindent 6 }}
+  {{- if eq .Values.istio.mtls.mode "STRICT" }}
+  # Operator receives traffic from kube-apiserver
+  portLevelMtls:
+    "4222":
+      mode: PERMISSIVE
+  {{- end }}
+{{- end }}
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