Adapt the `ACTION_OT_select_leftright`, `ACTION_OT_select_box` and `ACTION_OT_select_column` operators to take into account grease pencil layer channels. These operators call `actkeys_select_leftright`, `box_select_elem`, and `markers_selectkeys_between`, respectively. In these three functions, grease pencil layer channels are considered now. This resolves #110522. Pull Request: https://projects.blender.org/blender/blender/pulls/110939