Use 'new' expression in places where the type is evident for content (#2590)

* Content.Client

* Content.Benchmarks

* Content.IntegrationTests

* Content.Server

* Content.Server.Database

* Content.Shared

* Content.Tests

* Merge fixes

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Content.Server/GameObjects/Components/Doors/AirlockComponent.cs

@@ -36,7 +36,7 @@ namespace Content.Server.GameObjects.Components.Doors
         /// </summary>
         private static readonly TimeSpan PowerWiresTimeout = TimeSpan.FromSeconds(5.0);
 
-        private CancellationTokenSource _powerWiresPulsedTimerCancel = new CancellationTokenSource();
+        private CancellationTokenSource _powerWiresPulsedTimerCancel = new();
 
         private bool _powerWiresPulsed;