Make tests faster (#8737)

* Test changes

* Make finding the test tile a little smarter

Content.IntegrationTests/PoolManagerTestEventHandler.cs

@@ -0,0 +1,15 @@
+using NUnit.Framework;
+
+[assembly: Parallelizable(ParallelScope.Children)]
+
+namespace Content.IntegrationTests;
+
+[SetUpFixture]
+public sealed class PoolManagerTestEventHandler
+{
+    [OneTimeTearDown]
+    public void TearDown()
+    {
+        PoolManager.Shutdown();
+    }
+}