Extracts magic strings from Tag calls (#36305)

* Extracts magic strings from Tag calls

When #36281 gets merged, the `TagSystem` methods will all give warnings. Let's fix those warnings before they even happen!

* Adds missing libraries

* Remove not yet implemented TagSystem changes

* Fix tag spelling error

Genuinely surprised there was only 1!

* Styling and proper type changes

* Styling

Co-authored-by: Tayrtahn <tayrtahn@gmail.com>

---------

Co-authored-by: Tayrtahn <tayrtahn@gmail.com>

Content.Server/Procedural/DungeonJob/DungeonJob.PostGen.cs

@@ -1,8 +1,10 @@
 using System.Numerics;
 using Content.Shared.Procedural;
+using Content.Shared.Tag;
 using Robust.Shared.Collections;
 using Robust.Shared.Map.Components;
 using Robust.Shared.Physics.Components;
+using Robust.Shared.Prototypes;
 
 namespace Content.Server.Procedural.DungeonJob;
 
@@ -12,13 +14,15 @@ public sealed partial class DungeonJob
      * Run after the main dungeon generation
      */
 
+    private static readonly ProtoId<TagPrototype> WallTag = "Wall";
+
     private bool HasWall(Vector2i tile)
     {
         var anchored = _maps.GetAnchoredEntitiesEnumerator(_gridUid, _grid, tile);
 
         while (anchored.MoveNext(out var uid))
         {
-            if (_tags.HasTag(uid.Value, "Wall"))
+            if (_tags.HasTag(uid.Value, WallTag))
                 return true;
         }