Code Cleanup: Integration Tests (#29584)

* Cleanup PuddleTest

* Cleanup GravityGridTest

* Cleanup PowerTest

* Cleanup SaveLoadMapTest

* Cleanup Body tests

* Cleanup ContainerOcclusionTest

* Cleanup AirlockTest

* Cleanup DamageableTest

* Cleanup EntityTest

* Cleanup FluidSpillTest

* Cleanup FollowerSystemTest

* Cleanup HandCuffTest

* Cleanup InteractionSystemTests

* Cleanup InRangeUnobstructed

* Cleanup SimplePredictReconcileTest

* Cleanup PostMapInitTest

* Cleanup SalvageTest

* Cleanup SaveLoadSaveTest

* Cleanup ShuttleTest

* Cleanup MaterialArbitrageTest

* Cleanup PrototypeSaveTest

* Fix ShuttleTest

* Bunch of small ones

* Move JobTests to Station directory

* More small fixes

* Cleanup InteractionTest.Helpers
Had to change a method signature, so some callers were modified too.

* Missed one

Content.IntegrationTests/Tests/GameObjects/Components/ActionBlocking/HandCuffTest.cs

@@ -1,5 +1,4 @@
 #nullable enable
-using System.Numerics;
 using Content.Server.Cuffs;
 using Content.Shared.Body.Components;
 using Content.Shared.Cuffs.Components;
@@ -7,7 +6,6 @@ using Content.Shared.Hands.Components;
 using Robust.Server.Console;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Map;
-using Robust.Shared.Maths;
 
 namespace Content.IntegrationTests.Tests.GameObjects.Components.ActionBlocking
 {
@@ -52,10 +50,11 @@ namespace Content.IntegrationTests.Tests.GameObjects.Components.ActionBlocking
             var mapManager = server.ResolveDependency<IMapManager>();
             var host = server.ResolveDependency<IServerConsoleHost>();
 
+            var map = await pair.CreateTestMap();
+
             await server.WaitAssertion(() =>
             {
-                var mapId = mapManager.CreateMap();
-                var coordinates = new MapCoordinates(Vector2.Zero, mapId);
+                var coordinates = map.MapCoords;
 
                 var cuffableSys = entityManager.System<CuffableSystem>();
                 var xformSys = entityManager.System<SharedTransformSystem>();