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/CloningPod/CloningPodWindow.cs

@@ -33,7 +33,7 @@ namespace Content.Client.GameObjects.Components.CloningPod
         private CloningPodBoundUserInterfaceState _lastUpdate = null!;
 
         // List of scans that are visible based on current filter criteria.
-        private readonly Dictionary<int, string> _filteredScans = new Dictionary<int, string>();
+        private readonly Dictionary<int, string> _filteredScans = new();
 
         // The indices of the visible scans last time UpdateVisibleScans was ran.
         // This is inclusive, so end is the index of the last scan, not right after it.