Fix CI test logger failure on .NET 10 / vstest 18

GitHubActionsTestLogger 2.x uses the legacy VSTest extension discovery
mechanism which no longer works with vstest 18.0.1 shipped in the .NET 10
SDK. Switch to v3.0.1, which targets Microsoft.Testing.Platform (MTP) and
auto-registers via TestingPlatformBuilderHook — no explicit --logger flag
required.

- Add tests/Directory.Build.props to enable UseMicrosoftTestingPlatformRunner
  and include GitHubActionsTestLogger in all test projects (chains to root
  Directory.Build.props)
- Bump GitHubActionsTestLogger to 3.0.1 in Directory.Packages.props
- Remove --logger "github;..." from the CI test step (auto-registered by MTP)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: rockfordlhotka

.github/workflows/ci.yml

@@ -27,4 +27,4 @@ jobs:
         run: dotnet build --no-restore --configuration Release
 
       - name: Test
-        run: dotnet test --no-build --configuration Release --logger "github;summary.includePassedTests=true;summary.includeSkippedTests=true"
+        run: dotnet test --no-build --configuration Release

Directory.Packages.props

@@ -26,6 +26,7 @@
     <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="10.0.3" />
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.3" />
     <!-- Testing -->
+    <PackageVersion Include="GitHubActionsTestLogger" Version="3.0.1" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
     <PackageVersion Include="NSubstitute" Version="5.3.0" />
     <PackageVersion Include="xunit" Version="2.9.3" />

tests/Directory.Build.props

@@ -0,0 +1,14 @@
+<Project>
+  <Import Project="$([MSBuild]::GetPathOfFileAbove('Directory.Build.props', '$(MSBuildThisFileDirectory)../'))" />
+
+  <PropertyGroup>
+    <UseMicrosoftTestingPlatformRunner>true</UseMicrosoftTestingPlatformRunner>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="GitHubActionsTestLogger">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+</Project>