feat: add DeleteDataValidation method

[lzoeydzdnn]

Description

Add DeleteDataValidation method to delete data validations from a worksheet by given worksheet name and reference sequence. This function is concurrency safe.

If the reference sequence parameter is not specified, all data validations in the worksheet will be deleted.

This is a C# port of the Go Excelize DeleteDataValidation function (introduced in Go Excelize v2.8.0).

Usage

// Delete all data validations in Sheet1
excel.DeleteDataValidation("Sheet1", null);

// Delete specific data validations
excel.DeleteDataValidation("Sheet1", new[] { "A1:B2", "C3" });

Changes

• Add DeleteDataValidation(string sheet, string[]? seqs) method to Excelize.cs
• Add unit tests in UnitTest.cs
• Update XML doc comments

Testing

• All unit tests pass
• Code coverage remains at 100% for the new method
• Concurrency safety verified
• Hot path updated to clear formulas cache when data validations change

Compatibility

• No breaking changes
• Pure additive feature

Please review and merge.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (26b929a) to head (6793682).

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #12   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines         1373      1395   +22     
  Branches       208       213    +5     
=========================================
+ Hits          1373      1395   +22     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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[xuri]

LGTM, thanks for your contribution.