fix: 修复已禁用插件仍能通过监控平台的相关订阅步骤触发下发动作问题(closed #2313)

[chalice-1831]

PR

CheckList（PR Assigners）

确认已完成以下操作：

• 已将分支与当前合入分支同步
• 已在关联 Issue 中补充「功能自测」部分内容
• 已更新关联 Issue 的状态 backlog -> todo -> for test -> tested（需通过测试同学测试） -> done
• 将 PR 添加上 pr/reviewable

CheckList（PR Reviewers）

确认已完成以下操作：

• 检查关联 Issue 「功能自测」部分内容
• 必要时打回 pr/reviewable，要求重新修改
• 及时 Approve

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 75.16%. Comparing base (4f86151) to head (4f0c0a2).
Report is 3 commits behind head on v2.4.8-dev.

Files with missing lines	Patch %	Lines
apps/backend/subscription/steps/plugin.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           v2.4.8-dev    #2314      +/-   ##
==============================================
- Coverage       75.16%   75.16%   -0.01%     
==============================================
  Files             407      407              
  Lines           29544    29547       +3     
==============================================
+ Hits            22208    22210       +2     
- Misses           7336     7337       +1     

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