fix: bug on node iterator with nested nodes

[zoli]

When we have more than two level nodes nested (as children) the node iterator misses the first parent, because it goes as deep as possible at first.

Faced this while working on Table.

[codecov]

Codecov Report

Merging #1986 (298f694) into main (79a43de) will decrease coverage by 0.02%.
The diff coverage is 4.39%.

❗ Current head 298f694 differs from pull request most recent head 875c87e. Consider uploading reports for the commit 875c87e to get more accurate results

@@            Coverage Diff             @@
##             main    #1986      +/-   ##
==========================================
- Coverage   15.89%   15.88%   -0.02%     
==========================================
  Files         316      316              
  Lines       14055    14072      +17     
==========================================
+ Hits         2234     2235       +1     
- Misses      11821    11837      +16     

Flag	Coverage Δ
appflowy	15.88% <4.39%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
...database_view/application/database_controller.dart	0.00% <0.00%> (ø)
...tabase_view/application/database_view_service.dart	0.00% <0.00%> (ø)
...abase_view/application/field/field_controller.dart	0.00% <0.00%> (ø)
...resentation/plugins/base/built_in_page_widget.dart	0.00% <0.00%> (ø)
...presentation/plugins/base/link_to_page_widget.dart	0.00% <0.00%> (ø)
...esentation/plugins/cover/change_cover_popover.dart	0.00% <0.00%> (ø)
...tion/plugins/openai/widgets/smart_edit_action.dart	0.00% <ø> (ø)
...plugins/openai/widgets/smart_edit_node_widget.dart	0.00% <0.00%> (ø)
...lugins/openai/widgets/smart_edit_toolbar_item.dart	1.81% <0.00%> (+1.81%)	⬆️
...ter/lib/workspace/application/app/app_service.dart	8.47% <ø> (ø)
... and 4 more

... and 1 file with indirect coverage changes

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