Make pipes leak when destroyed (#20928)

This plugs a meta where atmos techs were fireaxing pipes to remove them without leaking their contents.

Content.Server/Atmos/Piping/EntitySystems/AtmosUnsafeUnanchorSystem.cs

@@ -5,6 +5,7 @@ using Content.Server.NodeContainer.Nodes;
 using Content.Server.Popups;
 using Content.Shared.Atmos;
 using Content.Shared.Construction.Components;
+using Content.Shared.Destructible;
 using Content.Shared.Popups;
 using JetBrains.Annotations;
 using Robust.Shared.Player;
@@ -21,6 +22,7 @@ namespace Content.Server.Atmos.Piping.EntitySystems
         {
             SubscribeLocalEvent<AtmosUnsafeUnanchorComponent, BeforeUnanchoredEvent>(OnBeforeUnanchored);
             SubscribeLocalEvent<AtmosUnsafeUnanchorComponent, UnanchorAttemptEvent>(OnUnanchorAttempt);
+            SubscribeLocalEvent<AtmosUnsafeUnanchorComponent, BreakageEventArgs>(OnBreak);
         }
 
         private void OnUnanchorAttempt(EntityUid uid, AtmosUnsafeUnanchorComponent component, UnanchorAttemptEvent args)
@@ -48,7 +50,24 @@ namespace Content.Server.Atmos.Piping.EntitySystems
 
         private void OnBeforeUnanchored(EntityUid uid, AtmosUnsafeUnanchorComponent component, BeforeUnanchoredEvent args)
         {
-            if (!component.Enabled || !EntityManager.TryGetComponent(uid, out NodeContainerComponent? nodes))
+            if (component.Enabled)
+                LeakGas(uid);
+        }
+
+        private void OnBreak(EntityUid uid, AtmosUnsafeUnanchorComponent component, BreakageEventArgs args)
+        {
+            LeakGas(uid);
+            // Can't use DoActsBehavior["Destruction"] in the same trigger because that would prevent us
+            // from leaking. So we make up for this by queueing deletion here.
+            QueueDel(uid);
+        }
+
+        /// <summary>
+        /// Leak gas from the uid's NodeContainer into the tile atmosphere.
+        /// </summary>
+        public void LeakGas(EntityUid uid)
+        {
+            if (!EntityManager.TryGetComponent(uid, out NodeContainerComponent? nodes))
                 return;
 
             if (_atmosphere.GetContainingMixture(uid, true, true) is not {} environment)