chore: remove the unit tests of Windows and macOS

[LucasXu0]

Feature Preview

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PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

[codecov]

Codecov Report

Merging #15 (0a7f02a) into main (6c3d7d2) will decrease coverage by 53.39%.
Report is 7 commits behind head on main.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##             main      #15       +/-   ##
===========================================
- Coverage   64.99%   11.60%   -53.39%     
===========================================
  Files         566      567        +1     
  Lines       26008    26211      +203     
===========================================
- Hits        16904     3043    -13861     
- Misses       9104    23168    +14064     

Flag	Coverage Δ
appflowy_flutter_integrateion_test	?
appflowy_flutter_unit_test	11.60% <0.00%> (-0.11%)	⬇️

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

Files	Coverage Δ
...entation/editor_plugins/actions/option_action.dart	0.00% <0.00%> (-2.46%)	⬇️
...esentation/editor_plugins/header/cover_editor.dart	0.00% <0.00%> (-71.75%)	⬇️
...ion/editor_plugins/image/image_selection_menu.dart	0.00% <0.00%> (-92.60%)	⬇️
...tion/editor_plugins/table/table_option_action.dart	0.00% <0.00%> (ø)
...appflowy_flutter/lib/startup/tasks/app_widget.dart	1.88% <0.00%> (-92.56%)	⬇️
...ditor_plugins/code_block/code_block_component.dart	3.27% <0.00%> (-80.33%)	⬇️
...lugins/document/presentation/more/more_button.dart	7.14% <0.00%> (-50.00%)	⬇️
...lib/plugins/document/presentation/editor_page.dart	3.58% <0.00%> (-76.87%)	⬇️
...document/presentation/more/font_size_switcher.dart	3.12% <0.00%> (-0.88%)	⬇️
.../presentation/editor_plugins/i18n/editor_i18n.dart	0.00% <0.00%> (ø)

... and 392 files with indirect coverage changes

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