fix(backend): 起動前の疎通チェックが機能しなくなっていた問題を修正

[kakkokari-gtyih]

What

allSettled does not throw if a promise is rejected, so check_connect never actually failed

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
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 39.97%. Comparing base (a77ad7a) to head (60614a1).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #15043      +/-   ##
===========================================
+ Coverage    39.96%   39.97%   +0.01%     
===========================================
  Files         1563     1563              
  Lines       197744   197744              
  Branches      3631     3647      +16     
===========================================
+ Hits         79027    79056      +29     
+ Misses      118112   118083      -29     
  Partials       605      605              

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