fix: paste should clear target cell value

[ybzky]

close https://github.com/dream-num/univer-pro/issues/3715
close https://github.com/dream-num/univer-pro/issues/3716
close https://github.com/dream-num/univer-pro/issues/3718
close https://github.com/dream-num/univer-pro/issues/2577

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).

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Playwright test results

 19 passed
 1 flaky

Details

 20 tests across 9 suites
 5 minutes, 1 second
 c7895ad
 For more information, see full report

Flaky tests

chromium › memory/memory.spec.ts › memory

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 33.67%. Comparing base (1121c76) to head (c7895ad).
Report is 7 commits behind head on dev.

Files with missing lines	Patch %	Lines
...ets-ui/src/services/clipboard/clipboard.service.ts	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #4268      +/-   ##
==========================================
+ Coverage   33.65%   33.67%   +0.01%     
==========================================
  Files        2495     2495              
  Lines      128248   128285      +37     
  Branches    28741    28755      +14     
==========================================
+ Hits        43167    43194      +27     
- Misses      85081    85091      +10     

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