feat(TargetFramework): support net10

[ArgoZhang]

Link issues

fixes #7099

Summary By Copilot

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

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

New Features:

• Add support for .NET 10 by updating target frameworks across the solution and test projects

[sourcery-ai]

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[Copilot]

Pull Request Overview

This PR adds support for .NET 10.0 target framework and refactors test project configurations for improved maintainability.

• Removes conditional versioning based on Visual Studio version, standardizing on .NET 10
• Adds net10.0 to the target frameworks list (net6.0, net7.0, net8.0, net9.0, net10.0)
• Centralizes test package references in test/Directory.Build.props
• Reorganizes solution file structure with better folder grouping

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Version.props	Removed Visual Studio version conditions, set net10.0 as default target framework and added it to multi-targeting list
src/BootstrapBlazor/BootstrapBlazor.csproj	Removed conditional versioning, set version to 10.0.0
test/Directory.Build.props	Centralized test package references (Microsoft.NET.Test.Sdk, xunit, coverlet), removed global Using directives
test/UnitTest/UnitTest.csproj	Removed duplicated test package references, added project-specific Using directives
test/UnitTest.Localization/UnitTest.Localization.csproj	Removed duplicated test package references, added project-specific Using directives
test/UnitTestDocs/UnitTestDocs.csproj	Removed duplicated test package references and property group, removed obsolete Using Remove directives
test/UniTest.Sass/UniTest.Sass.csproj	Cleaned up to minimal project file by removing package references and Using Remove directives
BootstrapBlazor.slnx	Reorganized file structure with dedicated folders for props files

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (5e93bb5) to head (69e9024).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #7100   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          745       745           
  Lines        32548     32548           
  Branches      4510      4510           
=========================================
  Hits         32548     32548           

Flag	Coverage Δ
BB	100.00% <ø> (?)

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