Grave digging and decomposition (#23646)

* Grave digging and decomposition

* fix

* update based on review comments

* code review

* remove unused field

Content.Server/Botany/Systems/PlantHolderSystem.cs

@@ -7,6 +7,7 @@ using Content.Server.Ghost.Roles.Components;
 using Content.Server.Kitchen.Components;
 using Content.Server.Popups;
 using Content.Shared.Botany;
+using Content.Shared.Burial.Components;
 using Content.Shared.Chemistry.Reagent;
 using Content.Shared.Coordinates.Helpers;
 using Content.Shared.Examine;
@@ -191,7 +192,7 @@ public sealed class PlantHolderSystem : EntitySystem
             return;
         }
 
-        if (_tagSystem.HasTag(args.Used, "Shovel"))
+        if (HasComp<ShovelComponent>(args.Used))
         {
             if (component.Seed != null)
             {