test(formula): refactor codeFragment cache && speed up event test

[toadfanszz]

cc @stackia

[codecov]

Codecov Report

Merging #482 (bb3438d) into main (dc1e575) will decrease coverage by 0.04%.
The diff coverage is 14.28%.

@@            Coverage Diff             @@
##             main     #482      +/-   ##
==========================================
- Coverage   69.41%   69.37%   -0.05%     
==========================================
  Files        1070     1070              
  Lines       18416    18418       +2     
  Branches     2572     2573       +1     
==========================================
- Hits        12783    12777       -6     
- Misses       5314     5325      +11     
+ Partials      319      316       -3     

Flag	Coverage Δ
frontend-unit	65.05% <14.28%> (-0.05%)	⬇️

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

Impacted Files	Coverage Δ
packages/formula/src/type/index.ts	100.00% <ø> (ø)
.../components/ui/Formula/Preview/FunctionPreview.tsx	72.72% <ø> (ø)
packages/formula/src/context/context.ts	74.62% <7.69%> (-4.17%)	⬇️
...rc/tests/feature/event/spreadsheetDeadlockEvent.ts	100.00% <100.00%> (ø)
packages/formula/src/grammar/codeFragment.ts	92.35% <0.00%> (-0.64%)	⬇️
packages/formula/src/context/variable.ts	84.30% <0.00%> (-0.45%)	⬇️
packages/formula/src/grammar/completer.ts	94.69% <0.00%> (+1.63%)	⬆️

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[github-actions]

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