Revert "scripts: remove board name from the qualifiers in list_boards.py"

This reverts commit 66b475a3.

This commit has broken CI. Let's revert it.
See https://github.com/zephyrproject-rtos/zephyr/issues/70614



Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>