fix: default sort policy of attachment groups

[ruibaby]

What type of PR is this?

/area ui
/kind bug
/milestone 2.14.0

What this PR does / why we need it:

为附件分组设置默认排序规则（按照创建时间升序），和 2.13.0 版本之间保持一致。

Which issue(s) this PR fixes:

Fixes #5429

Special notes for your reviewer:

测试方式：

1. 创建若干附件分组。
2. 观察排序是否符合预期。

Does this PR introduce a user-facing change?

修复附件管理中的分组排序不固定的问题。

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.81%. Comparing base (5fdf6c0) to head (bc93b22).
Report is 47 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5495      +/-   ##
============================================
- Coverage     56.91%   56.81%   -0.10%     
- Complexity     3319     3321       +2     
============================================
  Files           587      589       +2     
  Lines         18968    19082     +114     
  Branches       1401     1365      -36     
============================================
+ Hits          10795    10841      +46     
- Misses         7594     7668      +74     
+ Partials        579      573       -6     

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[guqing]

/lgtm

[f2c-ci-robot]

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