gbmcweb: Add Redfish BootOption DELETE Adds DELETE /redfish/v1/Systems/<id>/Boot/BootOptions/<ref>/ to remove a UEFI boot option via SystemRegistry::DeleteBootOption. - Returns 204 No Content on success, 404 if the boot option does not exist, and 500 for any other registry error. Google-Bug-Id:539554519 PiperOrigin-RevId: 995317696 Change-Id: Ib65aa8a3f81d9f845b0bfd90616a7c09a6fdfedd