Reduced Warning Count By 130 For Full Rebuilds (#26518)

* remove deprecated entity coordinate extension functions. Reduces warning count by approximately 50

* final toCoords Removed

* Remove all unused variables and dead code paths

* remove always true variable, should be a cvar or something instead

* remove superfluous variables from tests

Content.Client/IconSmoothing/IconSmoothSystem.cs

@@ -16,8 +16,6 @@ namespace Content.Client.IconSmoothing
     [UsedImplicitly]
     public sealed partial class IconSmoothSystem : EntitySystem
     {
-        [Dependency] private readonly IMapManager _mapManager = default!;
-
         private readonly Queue<EntityUid> _dirtyEntities = new();
         private readonly Queue<EntityUid> _anchorChangedEntities = new();