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/EntitySystems/AtmosDebugOverlaySystem.cs

@@ -18,7 +18,7 @@ namespace Content.Client.GameObjects.EntitySystems
         [Dependency] private readonly IMapManager _mapManager = default!;
 
         private readonly Dictionary<GridId, AtmosDebugOverlayMessage> _tileData =
-            new Dictionary<GridId, AtmosDebugOverlayMessage>();
+            new();
 
         public override void Initialize()
         {