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

(cherry picked from commit 59e46aab93)

Content.Server/Chemistry/Containers/EntitySystems/SolutionContainerSystem.cs

@@ -4,7 +4,6 @@ using Content.Shared.Chemistry.EntitySystems;
 using Content.Shared.FixedPoint;
 using Robust.Shared.Containers;
 using Robust.Shared.Map;
-using Robust.Shared.Network;
 using Robust.Shared.Utility;
 using System.Numerics;
 
@@ -12,8 +11,6 @@ namespace Content.Server.Chemistry.Containers.EntitySystems;
 
 public sealed partial class SolutionContainerSystem : SharedSolutionContainerSystem
 {
-    [Dependency] private readonly INetManager _netManager = default!;
-
     public override void Initialize()
     {
         base.Initialize();