Show the nodes summary for each cluster

Don't show the summary only for the first configured cluster, but for each.

Instead of utilizing `run_once` which limits the execution to once per play,
just use the existing `when` condition to limit it to the 1st server of each
cluster.

Author: eliasp

tasks/summary.yml

@@ -31,11 +31,9 @@
       args:
         executable: /bin/bash
       changed_when: false
-      run_once: true
       retries: 5
       register: nodes_summary
 
     - name: K8s nodes state
       ansible.builtin.debug:
         var: nodes_summary.stdout_lines
-      run_once: true