Reduce Triggers Boilerplate. (#41086)

* Push 1

* cleanup + master merge

* launchontrigger

* A crumb of cleanup

---------

Co-authored-by: Princess Cheeseballs <66055347+Pronana@users.noreply.github.com>

Content.Shared/Trigger/Systems/TriggerOnRoundEndSystem.cs

@@ -6,10 +6,8 @@ namespace Content.Shared.Trigger.Systems;
 /// <summary>
 /// System for creating a trigger when the round ends.
 /// </summary>
-public sealed class TriggerOnRoundEndSystem : EntitySystem
+public sealed class TriggerOnRoundEndSystem : TriggerOnXSystem
 {
-    [Dependency] private readonly TriggerSystem _trigger = default!;
-
     /// <inheritdoc/>
     public override void Initialize()
     {
@@ -25,7 +23,7 @@ public sealed class TriggerOnRoundEndSystem : EntitySystem
         // trigger everything with the component
         while (triggerQuery.MoveNext(out var uid, out var comp))
         {
-            _trigger.Trigger(uid, null, comp.KeyOut);
+            Trigger.Trigger(uid, null, comp.KeyOut);
         }
     }
 }