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/DoAfter/DoAfterSystem.cs

@@ -35,7 +35,7 @@ namespace Content.Client.GameObjects.EntitySystems.DoAfter
 
         // Each component in range will have its own vBox which we need to keep track of so if they go out of range or
         // come into range it needs altering
-        private readonly HashSet<DoAfterComponent> _knownComponents = new HashSet<DoAfterComponent>();
+        private readonly HashSet<DoAfterComponent> _knownComponents = new();
 
         private IEntity? _attachedEntity;