fix(docs): use different means of obtaining BM node id

Turns out that non-admin users will see "None" in the value for
`OS-EXT-SRV-ATTR:hypervisor_hostname` field, so we use `baremetal node
list` instead which shows them list of their baremetal nodes.

Author: skrobul

docs/user-guide/openstack-console.md

@@ -22,12 +22,13 @@ Here is how to access it.
     | de556585-8710-4ec3-b9d7-daef148f2102 | test-server-5 | ACTIVE | mareks-svm-test4=192.168.0.14 | My-Ubuntu-24.04 | gp2.small |
     +--------------------------------------+---------------+--------+-------------------------------+-----------------+-----------+
 
-    ❯ openstack server show test-server-5 -c OS-EXT-SRV-ATTR:hypervisor_hostname
-    +-------------------------------------+--------------------------------------+
-    | Field                               | Value                                |
-    +-------------------------------------+--------------------------------------+
-    | OS-EXT-SRV-ATTR:hypervisor_hostname | 2fb79bdb-c925-4701-b304-b3768deeb85e |
-    +-------------------------------------+--------------------------------------+
+    ❯ openstack baremetal node list
+    +--------------------------------------+--------------+--------------------------------------+-------------+--------------------+-------------+
+    | UUID                                 | Name         | Instance UUID                        | Power State | Provisioning State | Maintenance |
+    +--------------------------------------+--------------+--------------------------------------+-------------+--------------------+-------------+
+    | 2fb79bdb-c925-4701-b304-b3768deeb85e | Dell-HP12YB4 | de556585-8710-4ec3-b9d7-daef148f2102 | power on    | active             | False       |
+    +--------------------------------------+--------------+--------------------------------------+-------------+--------------------+-------------+
+
     ```
 
     In the above output, the `2fb79bdb-c925-4701-b304-b3768deeb85e` is the one we