feat: 絵文字を登録する際にシステムユーザーとして再アップロード

[kozakura913]

What

絵文字を登録する際にシステムユーザーとして再アップロード

Why

登録したユーザーがアカウントを削除しても絵文字が消えないように

Additional info (optional)

Checklist

• コントリビューションガイドを読みました( Read the contribution guide)
• ローカル環境で動作しました(Test working in a local environment)
• (必要なら)CHANGELOG_YOJO.mdの更新((If needed) Update CHANGELOG_YOJO.md)
• (必要なら)テストの追加((If possible) Add tests)

[github-actions]

이 PR에 의한 api.json 차이

차이점은 여기에서 볼 수 있음

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[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 59.98%. Comparing base (10e333b) to head (355c669).
Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/backend/src/core/CustomEmojiService.ts	20.00%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #510      +/-   ##
===========================================
- Coverage    59.99%   59.98%   -0.02%     
===========================================
  Files          882      882              
  Lines       102328   102338      +10     
  Branches      2683     2629      -54     
===========================================
- Hits         61394    61389       -5     
- Misses       40877    40892      +15     
  Partials        57       57              

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