Make tests faster (#8737)

* Test changes

* Make finding the test tile a little smarter

Content.IntegrationTests/Tests/Atmos/ConstantsTest.cs

@@ -10,14 +10,13 @@ namespace Content.IntegrationTests.Tests.Atmos
 {
     [TestFixture]
     [TestOf(typeof(Atmospherics))]
-    public sealed class ConstantsTest : ContentIntegrationTest
+    public sealed class ConstantsTest
     {
         [Test]
         public async Task TotalGasesTest()
         {
-            var server = StartServer();
-
-            await server.WaitIdleAsync();
+            await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings{NoClient = true});
+            var server = pairTracker.Pair.Server;
 
             await server.WaitPost(() =>
             {
@@ -27,6 +26,7 @@ namespace Content.IntegrationTests.Tests.Atmos
 
                 Assert.That(Enum.GetValues(typeof(Gas)).Length, Is.EqualTo(Atmospherics.TotalNumberOfGases));
             });
+            await pairTracker.CleanReturnAsync();
         }
     }
 }