Migrate to xUnit v3 and Microsoft Testing Platform v2

[Dragemil]

No description provided.

[github-actions]

Summary

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
69	69	0	0	0	0	15.8s

_{🎉 No failed tests in this run. | ⏭️ No skipped tests in this run.}

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🔄 This comment has been updated

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.09%. Comparing base (5725fbb) to head (84b8aab).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #78       +/-   ##
===========================================
+ Coverage   65.67%   90.09%   +24.42%     
===========================================
  Files          37       34        -3     
  Lines         906      747      -159     
  Branches       50       46        -4     
===========================================
+ Hits          595      673       +78     
+ Misses        290       71      -219     
+ Partials       21        3       -18     

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[Copilot]

Pull request overview

This PR migrates the test infrastructure from xUnit v2 with VSTest to xUnit v3 with Microsoft Testing Platform v2. This is a significant modernization that simplifies the testing setup and provides better integration with newer .NET tooling.

Key Changes

• Migrated from xUnit v2 (2.9.3) to xUnit v3 (3.2.1) with Microsoft Testing Platform v2 adapter
• Replaced coverlet collector with Microsoft.Testing.Extensions.CodeCoverage for code coverage
• Converted integration test app from minimal APIs to traditional Startup class to resolve WebApplicationFactory compatibility issues with the new testing platform

Reviewed changes

Copilot reviewed 53 out of 53 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
publisher/test/Directory.Build.props	Consolidated test project configuration with global usings, Microsoft Testing Platform setup, and test execution arguments
publisher/Directory.Packages.props	Updated test package references from xUnit v2 ecosystem to xUnit v3 with MTP v2
publisher/test/coverage.xml	New Microsoft code coverage configuration replacing coverlet.runsettings
publisher/test/coverlet.runsettings	Removed legacy coverlet configuration file
publisher/test/*/*.csproj	Removed individual test project package references (now centralized in Directory.Build.props)
publisher/test/**/*.cs	Removed explicit using statements for FluentAssertions and Xunit (now global usings), updated CancellationToken usage to TestContext.Current.CancellationToken, changed IAsyncLifetime to return ValueTask
publisher/test/LeanCode.Pipe.IntegrationTests/App/Startup.cs	New traditional Startup class to work around WebApplicationFactory issues with Microsoft Testing Platform entry points
publisher/test/LeanCode.Pipe.IntegrationTests/App/Program.cs	Removed - replaced by Startup.cs
publisher/funnel_test_cluster/*/tests.dockerfile	Changed base image from SDK to aspnet runtime and updated entrypoints to use native executables with --explicit only flag
publisher/funnel_test_cluster/run-tests.sh	Updated log parsing to match new test output format from Microsoft Testing Platform
.github/workflows/publisher_ci.yml	Simplified test execution (no explicit coverage/logging flags), updated environment variable syntax, added test result processing and CTRF report publishing
.github/workflows/publisher_release.yml	Updated test execution commands and environment variable syntax
publisher/global.json	Added test runner configuration for Microsoft Testing Platform
publisher/.config/dotnet-tools.json	Added dotnet-coverage tool

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