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.IntegrationTests/Tests/Fluids/PuddleTest.cs

@@ -67,7 +67,7 @@ namespace Content.IntegrationTests.Tests.Fluids
 
             await server.WaitAssertion(() =>
             {
-                var coordinates = grid.ToCoordinates();
+                var coordinates = grid.Owner.ToCoordinates();
                 var solution = new Solution("Water", FixedPoint2.New(20));
 
                 Assert.That(spillSystem.TrySpillAt(coordinates, solution, out _), Is.False);