fix: improve file tree render speed

[erha19]

Types

• 🐛 Bug Fixes

Background or solution

🤖 Generated by Copilot at 81fc227

• Simplify the code by removing unnecessary promises (link)

fixed opensumi/ide-startup#75.

Changelog

🤖 Generated by Copilot at 81fc227

This pull request improves the file tree component by simplifying the code and reducing the blocking of the UI. It removes unnecessary async and await keywords from file-tree.service.ts and moves the file change listener to a non-blocking position in file-tree-model.service.ts.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (ac1e2c7) 57.63% compared to head (81fc227) 57.63%.

Additional details and impacted files

@@           Coverage Diff           @@
##            v2.26    #2912   +/-   ##
=======================================
  Coverage   57.63%   57.63%           
=======================================
  Files        1337     1337           
  Lines       84130    84128    -2     
  Branches    17483    17483           
=======================================
+ Hits        48485    48491    +6     
+ Misses      32395    32388    -7     
+ Partials     3250     3249    -1     

Flag	Coverage Δ
jsdom	52.65% <100.00%> (+<0.01%)	⬆️
node	16.80% <0.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...es/file-tree-next/src/browser/file-tree.service.ts	70.25% <100.00%> (-0.16%)	⬇️
...xt/src/browser/services/file-tree-model.service.ts	55.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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