New component: change alert level on trigger (#36581)

* adds component that lets change alert level on trigger

* oops, put stuff on wrong folder

* missclick, forgor a file

* slarti finds ways to improve code

* Apply suggestions from code review

---------

Co-authored-by: slarticodefast <161409025+slarticodefast@users.noreply.github.com>

Content.Server/AlertLevel/Systems/AlertLevelChangeOnTriggerSystem.cs

@@ -0,0 +1,27 @@
+using Content.Server.AlertLevel;
+using Content.Server.Explosion.EntitySystems;
+using Content.Server.Station.Systems;
+
+namespace Content.Server.AlertLevel.Systems;
+
+public sealed class AlertLevelChangeOnTriggerSystem : EntitySystem
+{
+    [Dependency] private readonly AlertLevelSystem _alertLevelSystem = default!;
+    [Dependency] private readonly StationSystem _station = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<AlertLevelChangeOnTriggerComponent, TriggerEvent>(OnTrigger);
+    }
+
+    private void OnTrigger(Entity<AlertLevelChangeOnTriggerComponent> ent, ref TriggerEvent args)
+    {
+        var stationUid = _station.GetOwningStation(ent.Owner);
+        if (!stationUid.HasValue)
+            return;
+
+        _alertLevelSystem.SetLevel(stationUid.Value, ent.Comp.Level, ent.Comp.PlaySound, ent.Comp.Announce, ent.Comp.Force);
+    }
+}