Migrate MagicOnion.Client.NativeAot.Tests from MSTest to TUnit

[Copilot]

Migrates the NativeAot tests from MSTest to TUnit framework.

Changes

• Package references: Added TUnit 0.4.105, removed MSTest.Sdk
• Project SDK: Changed from MSTest.Sdk/3.6.1 to standard Microsoft.NET.Sdk
• Test attributes: Replaced [TestMethod] with [Test], removed [TestClass]
• Assertions: Converted to TUnit's awaitable fluent API
• Test methods: All methods now async Task (required for awaited assertions)
• Removed: MSTestSettings.cs (MSTest-specific parallel execution config)

Migration pattern

// Before (MSTest)
[TestClass]
public class Tests 
{
    [TestMethod]
    public void MyTest() 
    {
        Assert.AreEqual(expected, actual);
        Assert.IsNotNull(value);
    }
}

// After (TUnit)
public class Tests 
{
    [Test]
    public async Task MyTest() 
    {
        await Assert.That(actual).IsEqualTo(expected);
        await Assert.That(value).IsNotNull();
    }
}

All 11 existing tests pass (5 in ResolverTest, 6 in UnaryTest).

Original prompt

Migrate MagicOnion.Client.NativeAot.Tests from MSTest to TUnit

Custom agent used: C# Expert
An agent designed to assist with software development tasks for .NET projects.

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