Update to .NET 10 SDK, xunit.v3.mtp-v2 + MTP, slnx, SDK-integrated package validation

[Copilot]

Modernises the build and test stack to .NET 10, replacing the legacy xunit/VSTest pipeline with Microsoft Testing Platform (MTP) and cleaning up accumulated workarounds.

SDK & CI

• global.json: SDK 10.0.201 + MTP opt-in via "test": { "runner": "Microsoft.Testing.Platform" }
• azure-pipelines.yml: drop redundant UseDotNet@2 workaround step
• ci.yaml: actions/checkout@v2 → @v4; switch build/test to Propulsion.slnx

Test projects

• Replace xunit + Microsoft.NET.Test.Sdk + xunit.runner.visualstudio with xunit.v3.mtp-v2 (3.2.2) and FsCheck.Xunit.v3 (3.3.3)
• Target net10.0; add <OutputType>Exe</OutputType> (required by xunit v3)
• Xunit.Abstractions.ITestOutputHelper → Xunit.ITestOutputHelper (xunit v3 namespace)
• FactIfBroker: xunit v3 seals Skip/Timeout on FactAttribute — switch from override to setting properties in the constructor body:

  type FactIfBroker() as self =
      inherit FactAttribute()
      do self.Skip <- if null <> Environment.GetEnvironmentVariable "TEST_KAFKA_BROKER" then null else "Skipping as no TEST_KAFKA_BROKER supplied"
      do self.Timeout <- 60 * 15 * 1000

• .NET 10 adds int64 overloads to TimeSpan.From*, making bare integer literals ambiguous — resolved with L suffix throughout (e.g. TimeSpan.FromSeconds 1L)

Package validation

• Remove <Sdk Name="Microsoft.DotNet.PackageValidation" .../> from all 13 library projects
• Centralise <EnablePackageValidation>true</EnablePackageValidation> in Directory.Build.props (Release only) — SDK-integrated since .NET 8

Solution

• Propulsion.sln → Propulsion.slnx via dotnet solution migrate

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[Copilot]

Pull request overview

This PR modernizes Propulsion’s build/test toolchain to .NET 10, migrating test execution to xUnit v3 on Microsoft Testing Platform (MTP), moving the repo to the .slnx solution format, and switching package validation to the SDK-integrated mechanism.

Changes:

• Upgrade SDK pinning to .NET 10.0.201 and opt dotnet test into Microsoft Testing Platform via global.json.
• Migrate test projects to net10.0 and xunit.v3.mtp-v2 (+ FsCheck.Xunit.v3 where applicable), including required xUnit v3 API/behavior updates.
• Replace per-project PackageValidation SDK usage with centralized EnablePackageValidation and update CI/build inputs to use Propulsion.slnx.

Reviewed changes

Copilot reviewed 30 out of 30 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/Propulsion.Tests/TestOutputLogger.fs	Update output helper type for xUnit v3 namespace.
tests/Propulsion.Tests/SourceTests.fs	Resolve .NET 10 TimeSpan.From* literal ambiguities with L suffix.
tests/Propulsion.Tests/SinkHealthTests.fs	Resolve .NET 10 TimeSpan.From* literal ambiguities with L suffix.
tests/Propulsion.Tests/Propulsion.Tests.fsproj	Move to net10.0, set OutputType=Exe, and switch to xUnit v3 MTP packages.
tests/Propulsion.MessageDb.Integration/Tests.fs	Resolve .NET 10 TimeSpan.From* literal ambiguities with L suffix.
tests/Propulsion.MessageDb.Integration/Propulsion.MessageDb.Integration.fsproj	Move to net10.0, set OutputType=Exe, and switch to xUnit v3 MTP package.
tests/Propulsion.Kafka.Integration/Propulsion.Kafka.Integration.fsproj	Move to net10.0, set OutputType=Exe, and switch to xUnit v3 MTP package.
tests/Propulsion.Kafka.Integration/MonitorIntegration.fs	Resolve .NET 10 TimeSpan.From* literal ambiguities with L suffix.
tests/Propulsion.Kafka.Integration/ConsumersIntegration.fs	Adjust FactIfBroker to set sealed xUnit v3 properties in constructor.
src/Propulsion/Propulsion.fsproj	Remove legacy Microsoft.DotNet.PackageValidation SDK usage.
src/Propulsion.SqlStreamStore/Propulsion.SqlStreamStore.fsproj	Remove legacy Microsoft.DotNet.PackageValidation SDK usage.
src/Propulsion.Prometheus/Propulsion.Prometheus.fsproj	Remove legacy Microsoft.DotNet.PackageValidation SDK usage.
src/Propulsion.MessageDb/Propulsion.MessageDb.fsproj	Remove legacy Microsoft.DotNet.PackageValidation SDK usage.
src/Propulsion.MemoryStore/Propulsion.MemoryStore.fsproj	Remove legacy Microsoft.DotNet.PackageValidation SDK usage.
src/Propulsion.Kafka/Propulsion.Kafka.fsproj	Remove legacy Microsoft.DotNet.PackageValidation SDK usage.
src/Propulsion.EventStoreDb/Propulsion.EventStoreDb.fsproj	Remove legacy Microsoft.DotNet.PackageValidation SDK usage.
src/Propulsion.EventStore/Propulsion.EventStore.fsproj	Remove legacy Microsoft.DotNet.PackageValidation SDK usage.
src/Propulsion.DynamoStore/Propulsion.DynamoStore.fsproj	Remove legacy Microsoft.DotNet.PackageValidation SDK usage.
src/Propulsion.DynamoStore.Lambda/Propulsion.DynamoStore.Lambda.fsproj	Remove legacy Microsoft.DotNet.PackageValidation SDK usage.
src/Propulsion.DynamoStore.Constructs/Propulsion.DynamoStore.Constructs.fsproj	Remove legacy Microsoft.DotNet.PackageValidation SDK usage.
src/Propulsion.CosmosStore3/Propulsion.CosmosStore3.fsproj	Remove legacy Microsoft.DotNet.PackageValidation SDK usage.
src/Propulsion.CosmosStore/Propulsion.CosmosStore.fsproj	Remove legacy Microsoft.DotNet.PackageValidation SDK usage.
Propulsion.slnx	Introduce .slnx solution format and list projects/files.
global.json	Pin .NET SDK 10.0.201 and opt into MTP test runner.
Directory.Build.props	Enable SDK-integrated package validation for Release builds.
CHANGELOG.md	Document the upgrade/migration changes.
build.proj	Adjust dotnet test options for new runner/logging pipeline.
azure-pipelines.yml	Remove explicit .NET SDK provisioning step from Linux job.
.github/workflows/ci.yaml	Update checkout action and switch build/test to Propulsion.slnx.