fix: Include class-level DependsOn attributes in generated test metadata

The GenerateDependencies method in TestMetadataGenerator was only collecting
[DependsOn] attributes from the test method. This caused class-level
[DependsOn] attributes to be ignored, meaning dependencies declared at the
class level were not being pulled in when filtering tests.

This fix adds methodSymbol.ContainingType.GetAttributes() to also capture
class-level DependsOn attributes, ensuring tests with class-level dependencies
are properly resolved and included when filtered.

Author: thomhurst

TUnit.Core.SourceGenerator/Generators/TestMetadataGenerator.cs

@@ -2478,6 +2478,7 @@ private static void GenerateReturnHandling(
     private static void GenerateDependencies(CodeWriter writer, Compilation compilation, IMethodSymbol methodSymbol)
     {
         var dependsOnAttributes = methodSymbol.GetAttributes()
+            .Concat(methodSymbol.ContainingType.GetAttributes())
             .Where(attr => attr.AttributeClass?.Name == "DependsOnAttribute" &&
                           attr.AttributeClass.ContainingNamespace?.ToDisplayString() == "TUnit.Core")
             .ToList();

TUnit.TestProject/DependsOnTests.cs

@@ -28,3 +28,31 @@ public static async Task AssertStartTimes()
         await Assert.That(_test2Start).IsAfterOrEqualTo(_test1Start.AddSeconds(4.9));
     }
 }
+
+public sealed class MyAsyncTest
+{
+    public static int NumberOfInvocations = 0;
+
+    [Test]
+    public async Task Test()
+    {
+        NumberOfInvocations += 1;
+        await Assert.That(NumberOfInvocations).IsEqualTo(1);
+    }
+}
+
+[EngineTest(ExpectedResult.Pass)]
+[DependsOn(typeof(MyAsyncTest), nameof(Test))]
+public sealed class DependsOn_AsyncTest
+{
+    [Test]
+    public async Task Test() => await Assert.That(MyAsyncTest.NumberOfInvocations).IsEqualTo(1);
+}
+
+[EngineTest(ExpectedResult.Pass)]
+[DependsOn(typeof(MyAsyncTest), nameof(Test))]
+public sealed class DependsOn_AsyncTest_Two
+{
+    [Test]
+    public async Task Test() => await Assert.That(MyAsyncTest.NumberOfInvocations).IsEqualTo(1);
+}