Revert "Actions Rework" (#6888)

Content.Client/Actions/ActionEvents.cs

@@ -1,11 +0,0 @@
-using Content.Shared.Actions.ActionTypes;
-
-namespace Content.Client.Actions;
-
-/// <summary>
-///     This event is raised when a user clicks on an empty action slot. Enables other systems to fill this slow.
-/// </summary>
-public sealed class FillActionSlotEvent : EntityEventArgs
-{
-    public ActionType? Action;
-}