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.Client/GameObjects/Components/Items/HandsComponent.cs

@@ -21,7 +21,7 @@ namespace Content.Client.GameObjects.Components.Items
 
         private HandsGui? _gui;
 
-        private readonly List<Hand> _hands = new List<Hand>();
+        private readonly List<Hand> _hands = new();
 
         [ViewVariables] public IReadOnlyList<Hand> Hands => _hands;