Remove unused ch-cert volume and related volumeMounts from PM backend deployment configuration

apps/pm/base/backend-deployment.yaml

@@ -18,14 +18,6 @@ spec:
         app: backend
         service: api
     spec:
-      volumes:
-        - name: ch-cert
-          configMap:
-            name: ch-cert
-            items:
-              - key: CA.pem
-                path: RootCA.crt
-            defaultMode: 420
       containers:
         - name: api
           image: cr.yandex/crp3ccidau046kdj8g9q/pm-backend:production_0843a55d
@@ -214,9 +206,5 @@ spec:
             requests:
               cpu: "1"
               memory: 1Gi
-          volumeMounts:
-            - name: ch-cert
-              readOnly: true
-              mountPath: /root/clickhouse
       imagePullSecrets:
         - name: regcred