fix: resolve race condition in HookExecutionOrderTests

The BeforeEvery(Test) hook in GlobalHookExecutionOrderSetup fires for
every test in the assembly. When tests run concurrently, another test's
BeforeEvery invocation calls Clear() on the shared list between the
Before hook and the test body, causing the test to see count=2 instead
of 3.

Filter the BeforeEvery hook to only act on HookExecutionOrderTests.

TUnit.Engine.Tests/HookExecutionOrderTests.cs

@@ -8,7 +8,12 @@ public sealed class GlobalHookExecutionOrderSetup
     [BeforeEvery(Test)]
     public static void GlobalSetup(TestContext context)
     {
-        HookExecutionOrderTests._executionOrder.Clear(); // Clear before each test
+        if (context.Metadata.TestDetails.ClassType != typeof(HookExecutionOrderTests))
+        {
+            return;
+        }
+
+        HookExecutionOrderTests._executionOrder.Clear();
         HookExecutionOrderTests._executionOrder.Add("BeforeEvery");
     }
 }