feat: remove the onRemove processing logic in the built-in FolderTree extension

[kiwiwong]

Description

Move the node removal logic from the built-in FolderTree extension to the test extension.

Fixes #583

[codecov]

Codecov Report

Merging #617 (9639ea2) into main (bfdf0bb) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #617      +/-   ##
==========================================
+ Coverage   88.88%   88.92%   +0.03%     
==========================================
  Files         185      185              
  Lines        5409     5416       +7     
  Branches     1218     1222       +4     
==========================================
+ Hits         4808     4816       +8     
+ Misses        593      592       -1     
  Partials        8        8              

Impacted Files	Coverage Δ
src/extensions/folderTree/index.tsx	22.22% <ø> (-2.78%)	⬇️
...c/services/workbench/explorer/folderTreeService.ts	99.41% <0.00%> (+0.02%)	⬆️
src/model/workbench/explorer/folderTree.tsx	92.59% <0.00%> (+0.59%)	⬆️

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[wewoor]

+1

[mortalYoung]

+1