Add a test for sliceable cargo bounty exploits (#28357)

Content.Server/Cargo/Systems/CargoSystem.Bounty.cs

@@ -300,6 +300,21 @@ public sealed partial class CargoSystem
         return IsBountyComplete(GetBountyEntities(container), entries, out bountyEntities);
     }
 
+    /// <summary>
+    /// Determines whether the <paramref name="entity"/> meets the criteria for the bounty <paramref name="entry"/>.
+    /// </summary>
+    /// <returns>true if <paramref name="entity"/> is a valid item for the bounty entry, otherwise false</returns>
+    public bool IsValidBountyEntry(EntityUid entity, CargoBountyItemEntry entry)
+    {
+        if (!_whitelistSys.IsValid(entry.Whitelist, entity))
+            return false;
+
+        if (entry.Blacklist != null && _whitelistSys.IsValid(entry.Blacklist, entity))
+            return false;
+
+        return true;
+    }
+
     public bool IsBountyComplete(HashSet<EntityUid> entities, IEnumerable<CargoBountyItemEntry> entries, out HashSet<EntityUid> bountyEntities)
     {
         bountyEntities = new();
@@ -313,7 +328,7 @@ public sealed partial class CargoSystem
             var temp = new HashSet<EntityUid>();
             foreach (var entity in entities)
             {
-                if (!_whitelistSys.IsValid(entry.Whitelist, entity) || (entry.Blacklist != null && _whitelistSys.IsValid(entry.Blacklist, entity)))
+                if (!IsValidBountyEntry(entity, entry))
                     continue;
 
                 count += _stackQuery.CompOrNull(entity)?.Count ?? 1;