Fix drain rescue task when `kube_override_hostname` is set (#9556)

This fixes a task failure in the rescue block that uncordons nodes after an unsuccessful drain. The issue occurs when `kube_override_hostname` is set and does not match `inventory_hostname`.

roles/upgrade/pre-upgrade/tasks/main.yml

@@ -119,11 +119,11 @@
 
   rescue:
     - name: Set node back to schedulable
-      command: "{{ kubectl }} uncordon {{ inventory_hostname }}"
+      command: "{{ kubectl }} uncordon {{ kube_override_hostname|default(inventory_hostname) }}"
       when: upgrade_node_uncordon_after_drain_failure
     - name: Fail after rescue
       fail:
-        msg: "Failed to drain node {{ inventory_hostname }}"
+        msg: "Failed to drain node {{ kube_override_hostname|default(inventory_hostname) }}"
       when: upgrade_node_fail_if_drain_fails
   delegate_to: "{{ groups['kube_control_plane'][0] }}"
   when: