Revert "Actions Rework" (#6888)

Content.Server/UserInterface/OpenUiActionEvent.cs

@@ -1,23 +0,0 @@
-using Content.Shared.Actions;
-using Robust.Shared.Reflection;
-using Robust.Shared.Serialization;
-
-namespace Content.Server.UserInterface;
-
-public sealed class OpenUiActionEvent : PerformActionEvent, ISerializationHooks
-{
-    [ViewVariables]
-    public Enum? Key { get; set; }
-
-    [DataField("key", readOnly: true, required: true)]
-    private string _keyRaw = default!;
-
-    void ISerializationHooks.AfterDeserialization()
-    {
-        var reflectionManager = IoCManager.Resolve<IReflectionManager>();
-        if (reflectionManager.TryParseEnumReference(_keyRaw, out var key))
-            Key = key;
-        else
-            Logger.Error($"Invalid UI key ({_keyRaw}) in open-UI action");
-    }
-}