Replace obsolete EntityWhitelist IsValid usages (#28465)

* Replace obsolete whitelist is valid with whitelist system

* Consistency

* Fix logic

* Bork

* I figured out how to get whitelists on the client lol

* test fail

* woops

* HELP ME FUNCTIONS

* Fix errors

* simplify

---------

Co-authored-by: plykiya <plykiya@protonmail.com>

Content.Server/Chat/Systems/ChatSystem.cs

@@ -22,6 +22,7 @@ using Content.Shared.Mobs.Systems;
 using Content.Shared.Players;
 using Content.Shared.Radio;
 using Content.Shared.Speech;
+using Content.Shared.Whitelist;
 using Robust.Server.Player;
 using Robust.Shared.Audio;
 using Robust.Shared.Audio.Systems;
@@ -58,6 +59,7 @@ public sealed partial class ChatSystem : SharedChatSystem
     [Dependency] private readonly SharedAudioSystem _audio = default!;
     [Dependency] private readonly SharedInteractionSystem _interactionSystem = default!;
     [Dependency] private readonly ReplacementAccentSystem _wordreplacement = default!;
+    [Dependency] private readonly EntityWhitelistSystem _whitelistSystem = default!;
 
     public const int VoiceRange = 10; // how far voice goes in world units
     public const int WhisperClearRange = 2; // how far whisper goes while still being understandable, in world units