fix: window task's ProcessedRow was zero when no pane is closed

[laysakura]

Issue number and link

Fixes: #236

Describe your changes

• Change the logic to calculate ProcessingRows for window tasks.

Checklist before requesting a review

• I follow the Semantic Pull Requests rules (bugfix/feature)
• I specified links to related issues (must: bugfix, want: feature)
• I have performed a self-review of my code (bugfix/feature)
• I have added thorough tests (bugfix/feature)
• I have edited ## [Unreleased] section in CHANGELOG.md following keep a changelog syntax (bugfix/feature)
• I {made/will make} a related pull request for documentation repo (feature)

[codecov]

Codecov Report

Merging #235 (270a69e) into main (f7893c2) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #235      +/-   ##
==========================================
+ Coverage   84.08%   84.11%   +0.03%     
==========================================
  Files         219      219              
  Lines       12779    12789      +10     
==========================================
+ Hits        10745    10758      +13     
+ Misses       2034     2031       -3     

Impacted Files	Coverage Δ
...cutor/task/pump_task/pump_subtask/query_subtask.rs	96.98% <100.00%> (+0.15%)	⬆️
...e/src/sql_processor/sql_parser/pest_parser_impl.rs	87.95% <0.00%> (+0.27%)	⬆️

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[laysakura]

check-dependencies will be fixed in #237