perf: back to post list when post is first created (halo-dev/console#709)

#### What type of PR is this?

/kind improvement
/milestone 2.0

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

首次创建文章或者自定义页面时，跳转回管理列表，与编辑保持一致。

#### Special notes for your reviewer:

/cc @halo-dev/sig-halo-console 

测试方式：创建一篇新的文章或自定义页面，点击发布，观察是否返回到了管理列表。

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

```release-note
None
```

src/modules/contents/pages/SinglePageEditor.vue

@@ -140,6 +140,7 @@ const handlePublish = async () => {
       await apiClient.singlePage.draftSinglePage({
         singlePageRequest: formState.value,
       });
+      router.push({ name: "SinglePages" });
     }
 
     Toast.success("发布成功");

src/modules/contents/posts/PostEditor.vue

@@ -144,6 +144,8 @@ const handlePublish = async () => {
       await apiClient.post.publishPost({
         name: data.metadata.name,
       });
+
+      router.push({ name: "Posts" });
     }
 
     Toast.success("发布成功", { duration: 2000 });