fix(backend/test): #14558 以降e2eテストがたまに失敗する問題を修正

[kakkokari-gtyih]

What

謎

Why

Additional info (optional)

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

[github-actions]

このPRによるapi.jsonの差分
差分はありません。
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 39.68%. Comparing base (0d7d109) to head (e517fc3).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #14709      +/-   ##
===========================================
- Coverage    41.29%   39.68%   -1.62%     
===========================================
  Files         1553     1549       -4     
  Lines       200329   194593    -5736     
  Branches      3624     2570    -1054     
===========================================
- Hits         82735    77217    -5518     
+ Misses      117026   116810     -216     
+ Partials       568      566       -2     

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[syuilo]

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