fix: permissions for post content versions (halo-dev#5819)

#### What type of PR is this?
/kind bug
/area core
/milestone 2.15.x

#### What this PR does / why we need it:
修复拥有文章管理权限的用户无法正常使用版本历史的问题

#### Which issue(s) this PR fixes:
Fixes halo-dev#5815 

#### Does this PR introduce a user-facing change?
```release-note
修复拥有文章管理权限的用户无法正常使用版本历史的问题
```

application/src/main/resources/extensions/role-template-post.yaml

@@ -37,5 +37,5 @@ rules:
     resources: [ "posts" ]
     verbs: [ "get", "list" ]
   - apiGroups: [ "api.console.halo.run" ]
-    resources: [ "posts", "posts/head-content", "posts/release-content", "posts/snapshot" ]
+    resources: [ "posts", "posts/head-content", "posts/release-content", "posts/snapshot", "posts/content" ]
     verbs: [ "get", "list" ]

application/src/main/resources/extensions/role-template-singlepage.yaml

@@ -35,5 +35,5 @@ rules:
     resources: [ "singlepages" ]
     verbs: [ "get", "list" ]
   - apiGroups: [ "api.console.halo.run" ]
-    resources: [ "singlepages", "singlepages/head-content", "singlepages/release-content", "singlepages/snapshot" ]
+    resources: [ "singlepages", "singlepages/head-content", "singlepages/release-content", "singlepages/snapshot", "singlepages/content" ]
     verbs: [ "get", "list" ]