Fix #132241: Grease Pencil: Preserve cyclic state when extruding

When extruding from points on a cyclic stroke (in which case it creates
a new detached stroke), the original stroke should remain cyclic. This
is achieved by gathering curve attributes first then manually set non
cyclic to newly created strokes.

Pull Request: https://projects.blender.org/blender/blender/pulls/132261

source/blender/editors/grease_pencil/intern/grease_pencil_edit.cc

@@ -2894,20 +2894,16 @@ static bke::CurvesGeometry extrude_grease_pencil_curves(const bke::CurvesGeometr
   selection.span.copy_from(dst_selected.as_span());
   selection.finish();
 
-  /* Cyclic attribute : newly created curves cannot be cyclic.
-   * NOTE: if the cyclic attribute is single and false, it can be kept this way.
-   */
-  if (src_cyclic.get_if_single().value_or(true)) {
-    dst.cyclic_for_write().drop_front(old_curves_num).fill(false);
-  }
-
   bke::gather_attributes(src_attributes,
                          bke::AttrDomain::Curve,
                          bke::AttrDomain::Curve,
-                         bke::attribute_filter_from_skip_ref({"cyclic"}),
+                         {},
                          dst_to_src_curves,
                          dst_attributes);
 
+  /* Cyclic attribute : newly created curves cannot be cyclic. */
+  dst.cyclic_for_write().drop_front(old_curves_num).fill(false);
+
   bke::gather_attributes(src_attributes,
                          bke::AttrDomain::Point,
                          bke::AttrDomain::Point,