fix: post slug generation not following selected strategy

[ruibaby]

What type of PR is this?

/area ui
/kind bug
/milestone 2.20.x

What this PR does / why we need it:

修复文章自动生成别名不按照别名生成策略生成的问题。

Which issue(s) this PR fixes:

Fixes #6913

Special notes for your reviewer:

需要测试：

1. 分类、标签创建和更新时的别名生成
2. 文章新建时，别名是否按照生成策略生成。

Does this PR introduce a user-facing change?

修复文章自动生成别名不按照别名生成策略生成的问题。

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[guqing]

/approve

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.21%. Comparing base (eff73dc) to head (cf08108).
Report is 24 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6914      +/-   ##
============================================
+ Coverage     56.99%   57.21%   +0.22%     
- Complexity     3999     4005       +6     
============================================
  Files           714      712       -2     
  Lines         24110    24113       +3     
  Branches       1585     1592       +7     
============================================
+ Hits          13742    13797      +55     
+ Misses         9756     9701      -55     
- Partials        612      615       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[JohnNiang]

新建页面并直接保存后，问题似乎仍然存在。

[ruibaby]

新建页面并直接保存后，问题似乎仍然存在。

请参考：#6118 (comment)

我不认为页面也需要自动生成别名。

[JohnNiang]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guqing, JohnNiang

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• ui/OWNERS [JohnNiang,guqing]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment