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/Disposal/DisposalHolderComponent.cs

@@ -47,7 +47,7 @@ namespace Content.Server.GameObjects.Components.Disposal
         ///     A list of tags attached to the content, used for sorting
         /// </summary>
         [ViewVariables]
-        public HashSet<string> Tags { get; set; } = new HashSet<string>();
+        public HashSet<string> Tags { get; set; } = new();
 
         private bool CanInsert(IEntity entity)
         {