[release-2.2] perf: refine display name of system default role (#3284)

This is an automated cherry-pick of #3280

/assign ruibaby

```release-note
为系统初始化的角色添加显示名称
```

src/main/resources/extensions/system-default-role.yaml

@@ -4,6 +4,8 @@ metadata:
   name: guest
   labels:
     rbac.authorization.halo.run/system-reserved: "true"
+  annotations:
+    rbac.authorization.halo.run/display-name: "访客"
 rules: [ ]
 
 ---
@@ -14,6 +16,7 @@ metadata:
   labels:
     rbac.authorization.halo.run/system-reserved: "true"
   annotations:
+    rbac.authorization.halo.run/display-name: "超级管理员"
     rbac.authorization.halo.run/ui-permissions: |
       ["*"]
 rules: