test: add opened editor e2e test

[erha19]

Types

• ⏱ Tests

Background or solution

追加测试：

• 打开编辑器文件，界面正常同步文件
• 发生分栏操作时，“打开的编辑器” 面板自动分组展示
• 编辑器内文件发生修改，Dirty 状态在 “打开的编辑器” 面板正常展示
• 关闭编辑器文件后，“打开的编辑器” 面板展示的文件数量减少 1 个

Changelog

add opened editor e2e test

[codecov]

Codecov Report

Base: 57.64% // Head: 57.63% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (481c199) compared to base (8e9c90f).
Patch coverage: 60.83% of modified lines in pull request are covered.

❗ Current head 481c199 differs from pull request most recent head 34a38fe. Consider uploading reports for the commit 34a38fe to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1863      +/-   ##
==========================================
- Coverage   57.64%   57.63%   -0.02%     
==========================================
  Files        1284     1284              
  Lines       80399    80396       -3     
  Branches    16826    16826              
==========================================
- Hits        46350    46335      -15     
- Misses      30969    30980      +11     
- Partials     3080     3081       +1     

Flag	Coverage Δ
jsdom	52.39% <60.67%> (-0.01%)	⬇️
node	15.89% <3.85%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
packages/core-browser/src/monaco/index.ts	100.00% <ø> (ø)
packages/debug/src/browser/debug-session.ts	10.84% <ø> (ø)
...ension/src/browser/extension-management.service.ts	47.36% <0.00%> (ø)
packages/extension/src/common/vscode/extension.ts	52.00% <ø> (ø)
...ackages/main-layout/src/browser/quick-open-view.ts	18.75% <0.00%> (ø)
packages/monaco/src/browser/contrib/tokenizer.ts	100.00% <ø> (ø)
packages/monaco/src/browser/index.ts	0.00% <ø> (ø)
packages/theme/src/browser/icon.service.ts	81.48% <ø> (ø)
...on/src/browser/vscode/contributes/views-welcome.ts	38.29% <8.33%> (ø)
.../browser/vscode/contributes/semanticTokenScopes.ts	30.00% <9.09%> (ø)
... and 116 more

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