Board setup rows should be sortable when inserting new elements. They
get sorted when saving, this keeps that representation while editing
Fixes https://gitlab.com/kicad/code/kicad/issues/12015
For some kinds of issues, we want a way to point them out but
we don't need to keep the user from being able to close the
dialog. A separate Validate button lets the user check for
issues if desired, but these issues are not "fatal" and can
be ignored if the user wishes.