test: add search e2e test case

[erha19]

Types

• ⏱ Tests

Background or solution

新增如下测试：

• 搜索文本后进行批量替换
• 通过正则搜索内容
• 进行区分大小写的内容搜索，能得到正确结果
• 在编辑器中选中内容后，通过 CMD+SHIFT+F 可以在搜索面板进行快速搜索，正常展示搜索结果
• 已删除的文件不会再次出现在搜索内容中
• 点击搜索结果，在右侧编辑器展示响应内容

Kapture.2022-12-30.at.22.10.36.mp4

同时移除了搜索面板状态中冗余且无效的 isSearchFocus 状态存储，从根源处解决 #1203 问题。

#1475.

Changelog

add search e2e test case

[codecov]

Codecov Report

Base: 57.78% // Head: 57.78% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (d9a8af6) compared to base (f984ee6).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2149      +/-   ##
==========================================
- Coverage   57.78%   57.78%   -0.01%     
==========================================
  Files        1313     1313              
  Lines       83001    82991      -10     
  Branches    17257    17253       -4     
==========================================
- Hits        47966    47960       -6     
+ Misses      31844    31839       -5     
- Partials     3191     3192       +1     

Flag	Coverage Δ
jsdom	52.72% <ø> (-0.01%)	⬇️
node	16.52% <ø> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
packages/search/src/browser/search.service.ts	49.76% <ø> (-0.13%)	⬇️
...ages/search/src/browser/tree/tree-model.service.ts	13.25% <ø> (+0.38%)	⬆️
packages/search/src/common/content-search.ts	67.08% <ø> (ø)
...kages/theme/src/browser/workbench.theme.service.ts	71.38% <0.00%> (-0.58%)	⬇️
...erences/src/browser/preference-settings.service.ts	76.41% <0.00%> (-0.44%)	⬇️

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[erha19]

进一步追加了新的测试：

• 搜索文本后进行批量替换
• 已删除的文件不会再次出现在搜索内容中
• 点击搜索结果，在右侧编辑器展示响应内容