fix(backend): プロキシアカウントからのフォローリクエストがある場合は再度送信しないように

[kakkokari-gtyih]

What

Why

Fix #16001

Additional info (optional)

あってるか不明

Checklist

• Read the contribution guide
• Test working in a local environment
• (If needed) Add story of storybook
• (If needed) Update CHANGELOG.md
• (If possible) Add tests

[codecov]

Codecov Report

❌ Patch coverage is 20.00000% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.56%. Comparing base (a3b0dc9) to head (ee04d84).

Files with missing lines	Patch %	Lines
packages/backend/src/core/UserFollowingService.ts	13.33%	13 Missing ⚠️
packages/backend/src/core/QueueService.ts	50.00%	1 Missing ⚠️
packages/backend/src/core/UserListService.ts	0.00%	1 Missing ⚠️
packages/backend/src/queue/types.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #17242      +/-   ##
===========================================
+ Coverage    63.54%   63.56%   +0.01%     
===========================================
  Files         1161     1161              
  Lines       116244   116259      +15     
  Branches      8360     8365       +5     
===========================================
+ Hits         73871    73895      +24     
+ Misses       40188    40160      -28     
- Partials      2185     2204      +19     

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[github-actions]

このPRによるapi.jsonの差分
差分はありません。
Get diff files from Workflow Page

[github-actions]

Backend memory usage comparison

Before GC

Metric	base (MB)	head (MB)	Diff (MB)	Diff (%)
VmRSS	315.96 MB	315.27 MB	-0.68 MB	-0.21%
VmHWM	315.96 MB	315.27 MB	-0.68 MB	-0.21%
VmSize	23110.05 MB	23109.58 MB	-0.46 MB	0%
VmData	1379.85 MB	1379.78 MB	-0.07 MB	0%

After GC

Metric	base (MB)	head (MB)	Diff (MB)	Diff (%)
VmRSS	315.96 MB	315.27 MB	-0.68 MB	-0.21%
VmHWM	315.96 MB	315.27 MB	-0.68 MB	-0.21%
VmSize	23110.05 MB	23109.58 MB	-0.46 MB	0%
VmData	1379.85 MB	1379.78 MB	-0.07 MB	0%

After Request

Metric	base (MB)	head (MB)	Diff (MB)	Diff (%)
VmRSS	316.37 MB	315.62 MB	-0.74 MB	-0.23%
VmHWM	316.37 MB	315.62 MB	-0.74 MB	-0.23%
VmSize	23110.05 MB	23109.58 MB	-0.46 MB	0%
VmData	1379.85 MB	1379.78 MB	-0.07 MB	0%

See workflow logs for details

[kakkokari-gtyih]

コンフリクト解消

[syuilo]

フォローリクエストがある状態かどうかというのはローカルのDBを見るだけでは判断できないと思うから、どっちかというと受け取り側で重複したフォローリクエストを弾くようにした方が良い気がするわね