Use WhereOneOrMany helper for the alternate version id filter

Filter the parent ids with the WhereOneOrMany query helper instead of a
raw Contains so the id list is wrapped in EF.Parameter and EF Core reuses
one compiled query plan across calls, matching how the rest of the item
queries build their id filters.

Jellyfin.Server.Implementations/Item/LinkedChildrenService.cs

@@ -70,9 +70,9 @@ public class LinkedChildrenService : ILinkedChildrenService
         using var dbContext = _dbProvider.CreateDbContext();
 
         return dbContext.LinkedChildren
-            .Where(lc => (lc.ChildType == DbLinkedChildType.LocalAlternateVersion
-                    || lc.ChildType == DbLinkedChildType.LinkedAlternateVersion)
-                && itemIds.Contains(lc.ParentId))
+            .Where(lc => lc.ChildType == DbLinkedChildType.LocalAlternateVersion
+                || lc.ChildType == DbLinkedChildType.LinkedAlternateVersion)
+            .WhereOneOrMany(itemIds as IList<Guid> ?? itemIds.ToList(), lc => lc.ParentId)
             .Select(lc => lc.ParentId)
             .Distinct()
             .ToHashSet();