Replace IClickAlert with events (#30728)

* Replace IAlertClick with events

* whoop

* eek!

Content.Shared/Alert/AlertPrototype.cs

@@ -76,11 +76,11 @@ public sealed partial class AlertPrototype : IPrototype
     public bool SupportsSeverity => MaxSeverity != -1;
 
     /// <summary>
-    /// Defines what to do when the alert is clicked.
-    /// This will always be null on clientside.
+    /// Event raised on the user when they click on this alert.
+    /// Can be null.
     /// </summary>
-    [DataField(serverOnly: true)]
-    public IAlertClick? OnClick { get; private set; }
+    [DataField]
+    public BaseAlertEvent? ClickEvent;
 
     /// <param name="severity">severity level, if supported by this alert</param>
     /// <returns>the icon path to the texture for the provided severity level</returns>
@@ -114,3 +114,17 @@ public sealed partial class AlertPrototype : IPrototype
         return Icons[severity.Value - _minSeverity];
     }
 }
+
+[ImplicitDataDefinitionForInheritors]
+public abstract partial class BaseAlertEvent : HandledEntityEventArgs
+{
+    public EntityUid User;
+
+    public ProtoId<AlertPrototype> AlertId;
+
+    protected BaseAlertEvent(EntityUid user, ProtoId<AlertPrototype> alertId)
+    {
+        User = user;
+        AlertId = alertId;
+    }
+}