test: stop the AOT [EngineTest=Pass] run hitting its 5 minute budget

tests/TUnit.Engine.Tests/InvokableTestBase.cs

@@ -99,7 +99,10 @@ private async Task RunWithAot(string filter, List<Action<TestRun>> assertions,
                     "--report-trx", "--report-trx-filename", trxFilename,
                     "--diagnostic-verbosity", "Debug",
                     "--diagnostic", "--diagnostic-file-prefix", $"log_{GetType().Name}_AOT_",
-                    "--timeout", "5m",
+                    // A whole-session budget, not a hang detector. The [EngineTest=Pass] run takes
+                    // 3.5-5 minutes on Windows CI, so a 5m budget cancelled healthy runs mid-way
+                    // through the sequential global [NotInParallel] tail.
+                    "--timeout", "10m",
                     ..runOptions.AdditionalArguments
                 ]
             )

tests/TUnit.TestProject/Bugs/6885/Tests.cs

@@ -24,6 +24,8 @@ public class DedicatedThreadExecutorCleanUpOrderTests
 
     private static async Task AssertNoOverlapAsync()
     {
+        SlowCleanUpExecutor.MarkTestBodyRunning();
+
         var cleanUpRunningAtStart = SlowCleanUpExecutor.CleanUpRunning;
 
         // Longer than CleanUp(), so a previous test's late CleanUp() would reset the state mid-test.
@@ -40,22 +42,40 @@ private static async Task AssertNoOverlapAsync()
 /// <summary>
 /// Sets global state in Initialize() and resets it in a slow CleanUp().
 /// </summary>
+/// <remarks>
+/// The executor also runs every Before/After(Test) hook, including the project's many global
+/// [BeforeEvery]/[AfterEvery] hooks, each on its own dedicated thread. Only the test body's
+/// CleanUp() is slow: sleeping after every hook made each of these [NotInParallel] tests take
+/// about 16 seconds, which pushed the [EngineTest=Pass] run past its time budget.
+/// </remarks>
 public sealed class SlowCleanUpExecutor : DedicatedThreadExecutor
 {
     private static volatile bool s_cleanUpRunning;
     private static volatile string s_state = "reset";
 
+    // The test body runs on the executor's dedicated thread (its continuations are pumped there),
+    // so a thread-static flag tells CleanUp() whether this thread ran a test body or a hook.
+    [ThreadStatic]
+    private static bool t_ranTestBody;
+
     public static bool CleanUpRunning => s_cleanUpRunning;
 
     public static string State => s_state;
 
+    public static void MarkTestBodyRunning() => t_ranTestBody = true;
+
     protected override void Initialize()
     {
         s_state = "configured";
     }
 
     protected override void CleanUp()
     {
+        if (!t_ranTestBody)
+        {
+            return;
+        }
+
         s_cleanUpRunning = true;
         Thread.Sleep(300);
         s_state = "reset";