fix(auto-fill): merge-cell bugs in auto-fill

[yuhongz]

close https://github.com/dream-num/univer-pro/issues/2575
close https://github.com/dream-num/univer-pro/issues/2574

Pull Request Checklist

• Related tickets or issues have been linked in the PR description (or missing issue).
• Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• Unit tests have been added for the changes (if applicable).
• Breaking changes have been documented (or no breaking changes introduced in this PR).

[github-actions]

View Deployment

📑 Examples	📚 Storybook
🔗 Preview link	🔗 Preview link

[github-actions]

Playwright test results

 8 passed

Details

 8 tests across 3 suites
 2 minutes, 10 seconds
 11506dc
 For more information, see full report

[codecov]

Codecov Report

Attention: Patch coverage is 81.25000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 31.87%. Comparing base (1113984) to head (11506dc).
Report is 5 commits behind head on dev.

Files with missing lines	Patch %	Lines
.../sheets-ui/src/controllers/auto-fill.controller.ts	81.25%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #3606   +/-   ##
=======================================
  Coverage   31.87%   31.87%           
=======================================
  Files        2193     2193           
  Lines      115294   115295    +1     
  Branches    25402    25403    +1     
=======================================
+ Hits        36745    36746    +1     
  Misses      78549    78549           

Flag	Coverage Δ
	31.87% <81.25%> (+<0.01%)	⬆️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.