fix(frontend): Fix a frontend testing script

[woxtu]

What

$ pnpm --filter frontend run testを実行すると次のエラーが出るので修正します：

Error: You are using vitest without globals, this way we can't run cleanup after each test.
See https://testing-library.com/docs/vue-testing-library/setup for details or set the VTL_SKIP_AUTO_CLEANUP variable to 'true'

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (780b120) 78.72% compared to head (a0b2389) 78.71%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #12471      +/-   ##
===========================================
- Coverage    78.72%   78.71%   -0.02%     
===========================================
  Files          951      950       -1     
  Lines       103311   103247      -64     
  Branches      8301     8301              
===========================================
- Hits         81332    81268      -64     
  Misses       21979    21979              

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[syuilo]

🙏