Refactor Helm chart to use dynamic names for resources (#8142)

* Refactor Helm chart to use dynamic names for resources

* ensure name length

k8s/charts/seaweedfs/templates/filer/filer-servicemonitor.yaml

@@ -4,7 +4,7 @@
 apiVersion: monitoring.coreos.com/v1
 kind: ServiceMonitor
 metadata:
-  name: {{ template "seaweedfs.name" . }}-filer
+  name: {{ include "seaweedfs.fullname" . }}-filer
   namespace: {{ .Release.Namespace }}
   labels:
     app.kubernetes.io/name: {{ template "seaweedfs.name" . }}
@@ -27,6 +27,7 @@ spec:
   selector:
     matchLabels:
       app.kubernetes.io/name: {{ template "seaweedfs.name" . }}
+      app.kubernetes.io/instance: {{ .Release.Name }}
       app.kubernetes.io/component: filer
 {{- end }}
 {{- end }}