Stunnable New Status and Cleanup (#38618)

Co-authored-by: Princess Cheeseballs <66055347+Pronana@users.noreply.github.com>
Co-authored-by: pa.pecherskij <pa.pecherskij@interfax.ru>

Content.IntegrationTests/Tests/InventoryHelpersTest.cs

@@ -1,4 +1,4 @@
-using Content.Server.Stunnable;
+using Content.Server.Stunnable;
 using Content.Shared.Inventory;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
@@ -17,9 +17,7 @@ namespace Content.IntegrationTests.Tests
   components:
   - type: Inventory
   - type: ContainerContainer
-  - type: StatusEffects
-    allowed:
-    - Stun
+  - type: MobState
 
 - type: entity
   name: InventoryJumpsuitJanitorDummy
@@ -70,7 +68,7 @@ namespace Content.IntegrationTests.Tests
                 });
 #pragma warning restore NUnit2045
 
-                systemMan.GetEntitySystem<StunSystem>().TryStun(human, TimeSpan.FromSeconds(1f), true);
+                systemMan.GetEntitySystem<StunSystem>().TryUpdateStunDuration(human, TimeSpan.FromSeconds(1f));
 
 #pragma warning disable NUnit2045
                 // Since the mob is stunned, they can't equip this.