test(Config): update dependence config

[ArgoZhang]

Link issues

fixes #664

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

Update dependency configuration for test projects to fix #664

Enhancements:

• Synchronize dependency versions in Directory.Build.props for test projects
• Align package references across UnitTestEditor, UnitTestHoliday, UnitTestOpcDa, UnitTestOpcUa, UnitTestRegion, and UnitTestSvgIcon project files

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[Copilot]

Pull Request Overview

This PR consolidates common test dependencies by moving them from individual test project files to a central Directory.Build.props file, reducing duplication across the test suite.

• Moved common test-related PackageReferences to the shared test/Directory.Build.props file
• Removed duplicate PackageReference declarations from 6 individual test project files
• Centralized version management for test SDK, xunit, and code coverage tools

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/Directory.Build.props	Added centralized PackageReference declarations for test dependencies (Microsoft.NET.Test.Sdk, xunit, xunit.runner.visualstudio, coverlet.collector)
test/UnitTestSvgIcon/UnitTestSvgIcon.csproj	Removed duplicate test PackageReference declarations
test/UnitTestRegion/UnitTestRegion.csproj	Removed duplicate test PackageReference declarations
test/UnitTestOpcUa/UnitTestOpcUa.csproj	Removed duplicate test PackageReference declarations
test/UnitTestOpcDa/UnitTestOpcDa.csproj	Removed duplicate test PackageReference declarations
test/UnitTestHoliday/UnitTestHoliday.csproj	Removed duplicate test PackageReference declarations
test/UnitTestEditor/UnitTestEditor.csproj	Removed duplicate test PackageReference declarations

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