fix(frontend/plugin): AiScript内部のエラーハンドリングを使用しないように

[kakkokari-gtyih]

What

AiScriptのerrでエラーハンドリングすると内部でabortされてしまうので、エラーハンドリングをプラグインの結果を返す部分で行うように変更

Why

Fix #14050

Additional info (optional)

AiScriptのオプション側で、errに入ってもabortしないようにできるほうが良さそうではある → aiscript-dev/aiscript#710

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 0% with 49 lines in your changes missing coverage. Please review.

Project coverage is 20.16%. Comparing base (a6edd50) to head (0e950a9).
Report is 4 commits behind head on develop.

Files	Patch %	Lines
packages/frontend/src/plugin.ts	0.00%	49 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #14117       +/-   ##
============================================
- Coverage    61.94%   20.16%   -41.78%     
============================================
  Files         1004      698      -306     
  Lines       115259    97552    -17707     
  Branches      4594     1014     -3580     
============================================
- Hits         71399    19675    -51724     
- Misses       43828    77357    +33529     
- Partials        32      520      +488     

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