fix: update the LocaleService initial logic

[wewoor]

Description

修复在配置项中，变更 locale 后不生效的问题

Changes

• 优化 initilaize 逻辑
• 重构 reset 方法
• 重构 getCurrentLocale 方法
• 更新 单元测试文件

[codecov]

Codecov Report

Merging #397 (dc95957) into main (f99b10f) will increase coverage by 0.46%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #397      +/-   ##
==========================================
+ Coverage   80.80%   81.27%   +0.46%     
==========================================
  Files         177      177              
  Lines        4844     4848       +4     
  Branches     1044     1044              
==========================================
+ Hits         3914     3940      +26     
+ Misses        921      899      -22     
  Partials        9        9              

Impacted Files	Coverage Δ
src/i18n/localeService.ts	100.00% <100.00%> (ø)
src/services/settingsService.ts	100.00% <100.00%> (ø)
src/services/theme/helper.ts	100.00% <0.00%> (ø)
src/services/theme/colorRegistry.ts	100.00% <0.00%> (ø)
src/workbench/panel/panel.tsx	100.00% <0.00%> (+15.78%)	⬆️
src/components/monaco/index.tsx	100.00% <0.00%> (+21.05%)	⬆️
.../workbench/notification/notificationPane/index.tsx	100.00% <0.00%> (+78.94%)	⬆️

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[wewoor]

@ProfBramble 这条降低测试覆盖率的报告可以忽略

[ProfBramble]

+1