Resolve 'EntitySystem.Get<T>()' is obsolete in content (#27936)

* PROJECT 0 WARNINGS: Resolve `'EntitySystem.Get<T>()' is obsolete` in content

* pass entman

* dog ass test

* webeditor

Content.IntegrationTests/Tests/Commands/RestartRoundTest.cs

@@ -3,6 +3,7 @@ using Content.Server.GameTicking.Commands;
 using Content.Shared.CCVar;
 using Robust.Shared.Configuration;
 using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
 using Robust.Shared.Timing;
 
 namespace Content.IntegrationTests.Tests.Commands
@@ -40,8 +41,7 @@ namespace Content.IntegrationTests.Tests.Commands
 
                 tickBeforeRestart = entityManager.CurrentTick;
 
-                var command = new RestartRoundNowCommand();
-                command.Execute(null, string.Empty, Array.Empty<string>());
+                gameTicker.RestartRound();
 
                 if (lobbyEnabled)
                 {