TriggerOnSpawn + Admin toys (#23999)

* spawn on trigger, or trigger on spawn?

* fixes

* fix?

* revert

* fixes

* Update admin_triggers.yml

* pip

Content.Server/Explosion/Components/TriggerOnSpawnComponent.cs

@@ -0,0 +1,9 @@
+namespace Content.Server.Explosion.Components;
+
+/// <summary>
+/// calls the trigger when the object is initialized
+/// </summary>
+[RegisterComponent]
+public sealed partial class TriggerOnSpawnComponent : Component
+{
+}