enhance(frontend): adminのファイルリストでセンシティブファイルに枠線を追加

[kakkokari-gtyih]

What

Why

Fix #14389

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

Attention: Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

Project coverage is 19.99%. Comparing base (f7398fa) to head (11cc4a8).
Report is 17 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ges/frontend/src/components/MkFileListForAdmin.vue	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #14510      +/-   ##
===========================================
+ Coverage    19.97%   19.99%   +0.01%     
===========================================
  Files          725      725              
  Lines       100569   100588      +19     
  Branches      1047     1047              
===========================================
+ Hits         20089    20108      +19     
  Misses       79936    79936              
  Partials       544      544              

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[KisaragiEffective]

良さそう

[kakkokari-gtyih]

コンフリクト解消

[syuilo]

🙏🏿