Remove accidentally added file

Polygon_repair/include/CGAL/Polygon_repair/Union_rule.h

@@ -1,35 +0,0 @@
-// Copyright (c) 2024 GeometryFactory.
-// All rights reserved.
-//
-// This file is part of CGAL (www.cgal.org).
-//
-// $URL$
-// $Id$
-// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
-//
-// Author(s)     : Andreas Fabri
-
-#ifndef CGAL_POLYGON_REPAIR_UNION_RULE_H
-#define CGAL_POLYGON_REPAIR_UNION_RULE_H
-
-#include <CGAL/license/Polygon_repair.h>
-
-namespace CGAL {
-
-namespace Polygon_repair {
-
-/// \addtogroup PkgPolygonRepairRef
-/// @{
-
-/*!
-  Tag class to select the union rule when calling `CGAL::Polygon_repair::repair()`.
-  */
-  struct Union_rule {};
-
-///@}
-
-} // namespace Polygon_repair
-
-} // namespace CGAL
-
-#endif  // CGAL_POLYGON_REPAIR_UNION_RULE_H