Fix TUnit test execution on .NET 10 SDK

[Copilot]

.NET 10 SDK deprecated the VSTest MSBuild target for Microsoft.Testing.Platform. TUnit uses this platform, causing dotnet test to fail with "Testing with VSTest target is no longer supported by Microsoft.Testing.Platform on .NET 10 SDK and later."

Changes

• VSTestExecutionDriver.cs: Use dotnet run instead of dotnet test for TUnit projects

  • dotnet run --project <path> --no-build -- --report-trx
  • Bypasses deprecated VSTest target by invoking the test executable directly
  • Removed unused runProcessAction parameter (dead code cleanup)

• ProjectBuilder.cs: Added TestingPlatformDotnetTestSupport=true to TUnit project configuration for IDE/tooling compatibility

// TUnit execution now uses dotnet run
if (_testRunConfiguration.UnitTestProvider == UnitTestProvider.TUnit)
{
    arguments = $"run --project \"{_testProjectFolders.ProjectFolder}\" --no-build -- --report-trx";
    workingDirectory = _testProjectFolders.ProjectFolder;
}

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[Copilot]

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[304NotModified]

Build : https://github.com/reqnroll/Reqnroll/actions/runs/19750018991

[gasparnagy]

@304NotModified is this ready for review?