refactor(sheets-ui)!: remove duplicate command export

[hexf00]

AddWorksheetMergeAllCommand has multiple implementations

close #xxx

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]

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📑 Examples	📚 Storybook
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[github-actions]

Playwright test results

 20 passed

Details

 20 tests across 9 suites
 4 minutes, 49 seconds
 839ff73
 For more information, see full report

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.77%. Comparing base (01ecc28) to head (839ff73).
Report is 6 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #4175   +/-   ##
=======================================
  Coverage   33.77%   33.77%           
=======================================
  Files        2456     2456           
  Lines      127710   127710           
  Branches    28603    28603           
=======================================
  Hits        43129    43129           
  Misses      84581    84581           

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