chore: optimize default extension icon

[bk1012]

Types

• 🧹 Chores

Background or solution

插件默认 logo 为一张图片，改为由内置的 iconfont 实现

Changelog

Before:

After:

[codecov]

Codecov Report

Base: 57.44% // Head: 57.44% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (f0001a7) compared to base (392a82b).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2030   +/-   ##
=======================================
  Coverage   57.44%   57.44%           
=======================================
  Files        1292     1292           
  Lines       80886    80885    -1     
  Branches    16892    16892           
=======================================
  Hits        46468    46468           
+ Misses      31287    31286    -1     
  Partials     3131     3131           

Flag	Coverage Δ
jsdom	52.31% <ø> (+<0.01%)	⬆️
node	15.74% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/extension-manager/src/browser/const.ts	0.00% <ø> (ø)

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