fix: some case rich text style should convert to cell style

[ybzky]

close https://github.com/dream-num/univer-pro/issues/2604

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

Details

 19 tests across 9 suites
 4 minutes, 40 seconds
 4c263fa
 For more information, see full report

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 19 lines in your changes missing coverage. Please review.

Project coverage is 32.70%. Comparing base (39d0d46) to head (4c263fa).
Report is 14 commits behind head on dev.

Files with missing lines	Patch %	Lines
...ets-ui/src/services/clipboard/html-to-usm/utils.ts	0.00%	16 Missing ⚠️
...ui/src/services/clipboard/html-to-usm/converter.ts	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #3975      +/-   ##
==========================================
+ Coverage   32.46%   32.70%   +0.24%     
==========================================
  Files        2427     2439      +12     
  Lines      126046   126542     +496     
  Branches    28196    28342     +146     
==========================================
+ Hits        40915    41380     +465     
- Misses      85131    85162      +31     

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[yuhongz]

LGTM