-Fixes to undo redo to avoid crash, closes #24251

-Changed Animation to have a special signal when tracks are changed, to avoid unnecesary track cache rebuilds in AnimationPlayer
-Added missing emit_changed whe modifying keys to Animation
-Changed AnimationPlayer to use the new refcounted connections instead of the previous hacky way to keep references
-Changed AnimationEditor to update the current track when keys are edited
-Fixed bug where undo/redo did not work with AnimationKeyEdit (was not being updated)
-Made sure UndoRedo does not mind deleted objects in undo/redo history, this would corrupt the history or clear it without need.

editor/array_property_edit.h

@@ -52,6 +52,8 @@ class ArrayPropertyEdit : public Reference {
 	void _set_size(int p_size);
 	void _set_value(int p_idx, const Variant &p_value);
 
+	bool _dont_undo_redo();
+
 protected:
 	static void _bind_methods();
 	bool _set(const StringName &p_name, const Variant &p_value);