feat(formula): add function leftb

[Dushusir]

close #2573

The issue reported in #2610 has been fixed

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

 4 passed

Details

 4 tests across 2 suites
 1 minute, 23 seconds
 53efa8c
 For more information, see full report

[codecov]

Codecov Report

Attention: Patch coverage is 95.74468% with 2 lines in your changes missing coverage. Please review.

Project coverage is 30.70%. Comparing base (38b03fb) to head (53efa8c).
Report is 3 commits behind head on dev.

Files with missing lines	Patch %	Lines
...s/engine-formula/src/functions/text/leftb/index.ts	95.74%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #3418      +/-   ##
==========================================
+ Coverage   30.67%   30.70%   +0.02%     
==========================================
  Files        2156     2157       +1     
  Lines      113045   113092      +47     
  Branches    24777    24793      +16     
==========================================
+ Hits        34681    34726      +45     
- Misses      78364    78366       +2     

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[zhaolixin7]

@Dushusir 1、直接引用单元格和直接引用值结果不一致，引用单元格未报错


2、参数为true和false时结果未显示大写

[univer-bot]

Bot detected the issue body's language is not English, translate it automatically. 👯👭🏻🧑‍🤝‍🧑👫🧑🏿‍🤝‍🧑🏻👩🏾‍🤝‍👨🏿👬🏿

@Dushusir 1. The results of directly referencing the cell and directly referencing the value are inconsistent, and no error is reported for the referenced cell.


2. When the parameters are true and false, the result is not displayed in capital letters.