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/Chemistry/EntitySystems/SolutionInjectOnEventSystem.cs

@@ -9,6 +9,7 @@ using Content.Shared.Projectiles;
 using Content.Shared.Tag;
 using Content.Shared.Weapons.Melee.Events;
 using Robust.Shared.Collections;
+using Robust.Shared.Prototypes;
 
 namespace Content.Server.Chemistry.EntitySystems;
 
@@ -24,6 +25,8 @@ public sealed class SolutionInjectOnCollideSystem : EntitySystem
     [Dependency] private readonly SharedSolutionContainerSystem _solutionContainer = default!;
     [Dependency] private readonly TagSystem _tag = default!;
 
+    private static readonly ProtoId<TagPrototype> HardsuitTag = "Hardsuit";
+
     public override void Initialize()
     {
         base.Initialize();
@@ -93,7 +96,7 @@ public sealed class SolutionInjectOnCollideSystem : EntitySystem
 
             // Yuck, this is way to hardcodey for my tastes
             // TODO blocking injection with a hardsuit should probably done with a cancellable event or something
-            if (!injector.Comp.PierceArmor && _inventory.TryGetSlotEntity(target, "outerClothing", out var suit) && _tag.HasTag(suit.Value, "Hardsuit"))
+            if (!injector.Comp.PierceArmor && _inventory.TryGetSlotEntity(target, "outerClothing", out var suit) && _tag.HasTag(suit.Value, HardsuitTag))
             {
                 // Only show popup to attacker
                 if (source != null)