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/Instruments/InstrumentComponent.cs

@@ -1,6 +1,5 @@
 using Content.Server.UserInterface;
 using Content.Shared.Instruments;
-using Robust.Server.GameObjects;
 using Robust.Shared.Player;
 
 namespace Content.Server.Instruments;