doc(SelectTable): update ValidateForm sample code

[ArgoZhang]

update ValidateForm sample code

Summary of the changes (Less than 80 chars)

简单描述你更改了什么, 不超过80个字符；如果有关联 Issue 请在下方填写相关编号

Description

fixes #4946

Regression?

• Yes
• No

[If yes, specify the version the behavior has regressed from]

[是否影响老版本]

Risk

• High
• Medium
• Low

[Justify the selection above]

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Add data annotation validation to the SelectTable component example.

Enhancements:

• Improve the SelectTable component example by adding data annotation validation.

Documentation:

• Update the ValidateForm sample code in the SelectTable documentation.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR updates the ValidateForm sample code in the SelectTable component to fix issue #4946. It adds a [Required] attribute to the Foo property in the SelectTableMode class and updates the project file.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added a [Required] attribute to the Foo property	The Foo property in SelectTableMode is now marked as required	src/BootstrapBlazor.Server/Components/Samples/SelectTables.razor.cs
Updated project file	The project file was updated, likely due to the code change in SelectTables.razor.cs	src/BootstrapBlazor/BootstrapBlazor.csproj

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#4946	Update the ValidateForm sample code in SelectTable documentation by adding Required attribute	✅

Possibly linked issues

• doc(SelectTable): update ValidateForm sample code #4946: The PR updates ValidateForm sample code as requested in the issue.
• doc(SelectTable): update ValidateForm sample code #4946: The PR fixes the rendering inconsistency described in the issue by updating the ValidateForm sample code.
• doc(SelectTable): update ValidateForm sample code #4946: The PR fixes the issue by adding a validation rule.

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[sourcery-ai]

Hey @ArgoZhang - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (1195d0a) to head (7d0555d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #4947   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          629       629           
  Lines        28093     28093           
  Branches      4036      4036           
=========================================
  Hits         28093     28093           

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