Add test pooling (#4961)

* Add test pooling

* WIP test pooling changes

* Fix Destructible tests

* Don't pool unpooled or dummy ticker instances

* Change ServerPathfindingDebugSystem to replace existing entries

* Fix SaveLoadSaveTest comment

* Don't pool StartTest

* Comment out global setup

* Fix puddle tests

* Move SolarPanelComponent initialize to PowerSolarSystem OnMapInit

* Update RobustToolbox

* Finish fixing tests, make test threads background threads

* Bring back pooling

* Fix nullable

* Update RobustToolbox

* Set cvars on server return

* Un-pool tests with custom cvars

* Update RobustToolbox

* Update RobustToolbox

* Change where the main tile coordinates are

* Remove DisposalUnitTest grid check

* Fix test pooling being a fickle bitch

* Fix EntitySystemExtensionsTest

* Update RobustToolbox

* Update RobustToolbox

* Make nullable pool settings true

* Update RobustToolbox

* Wait other way around

* We are unitystation now

* Update RobustToolbox

* Create global setup

* Pool some more tests

* Fix not properly disconnecting clients before restarting the round

* Give more info on ran tests

* Standardize default test cvars

* Update RobustToolbox

* Update RobustToolbox

* Pool clients

* Fix test order issue

* Fix cvars in character creation test not being set properly

* Update RobustToolbox

* Update RobustToolbox

* Rider shut

* Update RobustToolbox

* Format tests ran better

* Update RobustToolbox

* Reset RobustToolbox

* Reset RobustToolbox harder

* Fix one instance of test order causing destructible tests to fail

Content.IntegrationTests/Tests/StartTest.cs

@@ -13,7 +13,10 @@ namespace Content.IntegrationTests.Tests
         [Test]
         public async Task TestServerStart()
         {
-            var server = StartServer();
+            var server = StartServer(new ServerContentIntegrationOption
+            {
+                Pool = false
+            });
             server.RunTicks(5);
             await server.WaitIdleAsync();
             Assert.That(server.IsAlive);
@@ -30,7 +33,10 @@ namespace Content.IntegrationTests.Tests
         [Test]
         public async Task TestClientStart()
         {
-            var client = StartClient();
+            var client = StartClient(new ClientContentIntegrationOption
+            {
+                Pool = false
+            });
             await client.WaitIdleAsync();
             Assert.That(client.IsAlive);
             client.RunTicks(5);