fix(frontend): ユーザーリストのバナー画像をプロキシを通すように

[kakkokari-gtyih]

What

Why

Fix #14450

Additional info (optional)

gif画像が通り、画像の縮小にも対応しているプロキシモードはavatarだったのでそれを使用した

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

[syuilo]

うーーーむ
bannerなのにavatar指定なのは違和感あるわね

[kakkokari-gtyih]

bannerなのにavatar指定なのは違和感あるわね

それは思ったけどproxyを外部化している場合はそちらの改修も必要になるのでどうしよう・・・

[kakkokari-gtyih]

ユーザーリストではgifなバナー画像が動かない仕様にするのでも良いかも

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 20.02%. Comparing base (043ab1f) to head (ddb932b).
Report is 1 commits behind head on develop.

Files	Patch %	Lines
packages/frontend/src/components/MkUserInfo.vue	0.00%	2 Missing ⚠️
packages/frontend/src/components/MkUserPopup.vue	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #14454       +/-   ##
============================================
- Coverage    39.89%   20.02%   -19.87%     
============================================
  Files         1547      725      -822     
  Lines       190970   100535    -90435     
  Branches      3519     1052     -2467     
============================================
- Hits         76190    20136    -56054     
+ Misses      114187    79855    -34332     
+ Partials       593      544       -49     

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