fix: initView and load extensions after workbench be ready

[wewoor]

Description

修复 monacoService 无法初始化的问题。由于layout.contaier 依赖 Workbench 对象，所以需要等 Workbench Ready 后，才能初始化 monacoService 已经相关插件，否则，布局会以 document.body 作为根容器，这样在嵌入式 Workbench 布局的中，会出现类似 CommandPalette 位置异常的问题。

Fixes #852

Changes

• 移动 initView， extension.load 逻辑到 onWorkbenchDidMount 中

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.07 ⚠️

Comparison is base (122eff9) 91.06% compared to head (da1a6d1) 91.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #853      +/-   ##
==========================================
- Coverage   91.06%   91.00%   -0.07%     
==========================================
  Files         188      188              
  Lines        6078     6080       +2     
  Branches     1476     1478       +2     
==========================================
- Hits         5535     5533       -2     
- Misses        537      541       +4     
  Partials        6        6              

Impacted Files	Coverage Δ
src/components/monaco/index.tsx	100.00% <100.00%> (ø)
src/services/instanceService.tsx	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[mortalYoung]

+1