remove grafana pv as it's using db now

grafana/application.yml

@@ -177,16 +177,9 @@ spec:
         - name: grafana-datasources
           configMap:
             name: grafana-datasources
-  volumeClaimTemplates:
+        - name: grafana-data
-    - metadata:
+          emptyDir:
-        name: grafana-data
+            sizeLimit: 500Mi
-      spec:
-        storageClassName: longhorn
-        accessModes:
-          - ReadWriteOnce
-        resources:
-          requests:
-            storage: 1Gi
 ---
 apiVersion: v1
 kind: Service