Objectives ecs rework (#19967)

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Server/Objectives/Components/PickRandomHeadComponent.cs

@@ -0,0 +1,12 @@
+using Content.Server.Objectives.Systems;
+
+namespace Content.Server.Objectives.Components;
+
+/// <summary>
+/// Sets the target for <see cref="TargetObjectiveComponent"/> to a random head.
+/// If there are no heads it will fallback to any person.
+/// </summary>
+[RegisterComponent, Access(typeof(KillPersonConditionSystem))]
+public sealed partial class PickRandomHeadComponent : Component
+{
+}