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/EntityTest.cs

@@ -2,8 +2,6 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
-using Content.Server.Power.Components;
-using Content.Server.PowerCell.Components;
 using Content.Shared.CCVar;
 using Content.Shared.Coordinates;
 using NUnit.Framework;
@@ -27,7 +25,7 @@ namespace Content.IntegrationTests.Tests
                 CVarOverrides = {{CCVars.AIMaxUpdates.Name, int.MaxValue.ToString()}}
             };
 
-            var server = StartServerDummyTicker(options);
+            var server = StartServer(options);
             await server.WaitIdleAsync();
 
             var mapManager = server.ResolveDependency<IMapManager>();
@@ -118,7 +116,7 @@ namespace Content.IntegrationTests.Tests
 - type: entity
   id: AllComponentsOneToOneDeleteTestEntity";
 
-            var server = StartServerDummyTicker(new ServerContentIntegrationOption
+            var server = StartServer(new ServerContentIntegrationOption
             {
                 ExtraPrototypes = testEntity,
                 FailureLogLevel = LogLevel.Error
@@ -221,10 +219,11 @@ namespace Content.IntegrationTests.Tests
 - type: entity
   id: AllComponentsOneEntityDeleteTestEntity";
 
-            var server = StartServerDummyTicker(new ServerContentIntegrationOption
+            var server = StartServer(new ServerContentIntegrationOption
             {
                 ExtraPrototypes = testEntity,
-                FailureLogLevel = LogLevel.Error
+                FailureLogLevel = LogLevel.Error,
+                Pool = false
             });
             await server.WaitIdleAsync();