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.Server/Spreader/SpreaderSystem.cs

@@ -18,7 +18,6 @@ namespace Content.Server.Spreader;
 /// </summary>
 public sealed class SpreaderSystem : EntitySystem
 {
-    [Dependency] private readonly IMapManager _mapManager = default!;
     [Dependency] private readonly IPrototypeManager _prototype = default!;
     [Dependency] private readonly IRobustRandom _robustRandom = default!;
     [Dependency] private readonly SharedMapSystem _map = default!;