perf: hide anonymousUser in user management list (#844)

#### What type of PR is this?

/kind improvement

#### What this PR does / why we need it:

在用户管理列表隐藏 anonymousUser 用户，anonymousUser 暂时没有实际用途。

#### Which issue(s) this PR fixes:

Fixes https://github.com/halo-dev/halo/issues/2775#issuecomment-1425129852

#### Screenshots:

<img width="1410" alt="image" src="https://user-images.githubusercontent.com/21301288/217997078-5e2e0724-5f22-45dc-a9c6-ee42254c9bd7.png">


#### Special notes for your reviewer:

测试方式：

1. 进入 Console 的用户管理，检查是否有名为 Anonymous User 的用户即可。

#### Does this PR introduce a user-facing change?

```release-note
在 Console 端的用户管理中隐藏 `Anonymous User` 用户。
```

src/modules/system/users/UserList.vue

@@ -58,6 +58,8 @@ const userStore = useUserStore();
 
 let fuse: Fuse<User> | undefined = undefined;
 
+const ANONYMOUSUSER_NAME = "anonymousUser";
+
 const handleFetchUsers = async (options?: { mute?: boolean }) => {
   try {
     clearInterval(refreshInterval.value);
@@ -69,6 +71,7 @@ const handleFetchUsers = async (options?: { mute?: boolean }) => {
     const { data } = await apiClient.extension.user.listv1alpha1User({
       page: users.value.page,
       size: users.value.size,
+      fieldSelector: [`name!=${ANONYMOUSUSER_NAME}`],
     });
     users.value = data;