fix: resolve the issue of ineffective duplicate key validation in AnnotationsForm

[LIlGG]

What type of PR is this?

/kind bug
/area console

What this PR does / why we need it:

在 AnnotationsForm 新增 customAnnotationsDuplicateKey 校验规则，校验自定义元数据中是否具有重复的 key。

Which issue(s) this PR fixes:

Fixes #4367

Special notes for your reviewer:

在任意一个使用 AnnotationsForm 的位置，例如文章设置 - 元数据 中，新增一个已经存在的 key，查看是否有重复 key 的校验。

Does this PR introduce a user-facing change?

修复 AnnotationsForm 重复的 key 校验无效的问题。

[codecov]

Codecov Report

Merging #4369 (96ab62e) into main (6b748ef) will not change coverage.
Report is 4 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #4369   +/-   ##
=========================================
  Coverage     60.97%   60.97%           
  Complexity     2492     2492           
=========================================
  Files           368      368           
  Lines         12911    12911           
  Branches        924      924           
=========================================
  Hits           7873     7873           
  Misses         4585     4585           
  Partials        453      453           

[guqing]

/approve
It works very well🎉

[ruibaby]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• console/OWNERS [guqing,ruibaby]

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