When specified the `erase_devices_metadata` clean step will be executed,
thus only erasing metadata on the disk.
On some hardware devices secure erase will fail with an error, that
prevents the fallback erasure of metadata from being executed. Adding
this parameter will allow to trigger the metadata cleaning explicitly
and thus provide a workaround to clean these nodes, albeit in a less
sophisticated and incomplete way.

The `delete_configuration` step is skipped for nodes with a RAID
interface as well, so that the parameter really only erases metadata
and leaves the logical disks in place.

Assisted-by: Claude:claude-opus-5[1m]
Signed-off-by: Jan Horstmann <horstmann@osism.tech>