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/MoMMILink.cs

@@ -23,7 +23,7 @@ namespace Content.Server
         [Dependency] private readonly IChatManager _chatManager = default!;
         [Dependency] private readonly ITaskManager _taskManager = default!;
 
-        private readonly HttpClient _httpClient = new HttpClient();
+        private readonly HttpClient _httpClient = new();
 
         void IPostInjectInit.PostInject()
         {