XUnit V3

[VladislavAntonyuk]

• Replaced all CancellationToken.None with new TestContext.Current.CancellationToken
• Fixed token validation for cancellation
• Removed old VSTest and replaced with new Microsoft Testing Platform https://learn.microsoft.com/en-us/dotnet/core/testing/unit-testing-platform-intro?tabs=dotnetcli
• Publish Test artifacts and prevent too many concurrent builds running
• Renamed azure-pipelines.yml as we will remove it soon.

[Copilot]

Copilot reviewed 2 out of 7 changed files in this pull request and generated no comments.

Files not reviewed (5)

• samples/CommunityToolkit.Maui.Sample.sln: Language not supported
• src/CommunityToolkit.Maui.Analyzers.UnitTests/CommunityToolkit.Maui.Analyzers.UnitTests.csproj: Language not supported
• src/CommunityToolkit.Maui.Analyzers.UnitTests/xunit.runner.json: Language not supported
• src/CommunityToolkit.Maui.UnitTests/CommunityToolkit.Maui.UnitTests.csproj: Language not supported
• src/CommunityToolkit.Maui.UnitTests/xunit.runner.json: Language not supported

[ne0rrmatrix]

This is amazing! I am currently on iteration 28 with zero errors! But the one issue still persisting in tests is line 63 public async Task InvalidValue_InvalidStyle() in ValidationBehaviorTests.cs is failing randomly. My tests have that commented out. If you can figure out that one test failing this PR will be even better. I am waiting for the local run to complete a 1000 round test. I am going to wait to see how it runs but i think this PR is very close to being ready. It is 100 percent better than current tests now. But that one test is still failing randomly.

[VladislavAntonyuk]

@ne0rrmatrix do you see the test (InvalidValue_InvalidStyle) fails randomly on your local env?
The last 2 builds on pipeline are stable without failed tests.
I updated the test to use custom comparison.

[ne0rrmatrix]

This looks great. I am happy with the results of this change. I see a 5X increase in average reliability after extensive testing in local environment.