preflight: old repos disablement refactor

This refacts the task that disables old repositories.
The speeds up this task which seems to be currently very time consuming.

```
TASK [disable older rhceph repositories if any] ****************************
changed: [localhost] => (item=rhceph-4-tools-for-rhel-8-x86_64-rpms)
changed: [localhost] => (item=rhceph-4-mon-for-rhel-8-x86_64-rpms)
changed: [localhost] => (item=rhceph-4-osd-for-rhel-8-x86_64-rpms)
changed: [localhost] => (item=rhceph-5-tools-for-rhel-8-x86_64-rpms)

PLAY RECAP *****************************************************************
localhost                  : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

real	3m18.439s
```

```
TASK [disable older rhceph repositories if any] ***********
changed: [localhost]

PLAY RECAP ***********************************************
localhost                  : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

real	0m47.198s
```

Also, this makes sure all previous repositories are disabled for both
el8 and el9.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=2181243

Signed-off-by: Guillaume Abrioux <gabrioux@ibm.com>

cephadm-preflight.yml

@@ -25,6 +25,11 @@
   become: true
   gather_facts: true
   vars:
+    repos_to_disable:
+      - rhceph-4-tools-for-rhel-{{ ansible_facts['distribution_major_version'] }}-{{ ansible_facts['architecture'] }}-rpms
+      - rhceph-4-mon-for-rhel-{{ ansible_facts['distribution_major_version'] }}-{{ ansible_facts['architecture'] }}-rpms
+      - rhceph-4-osd-for-rhel-{{ ansible_facts['distribution_major_version'] }}-{{ ansible_facts['architecture'] }}-rpms
+      - rhceph-5-tools-for-rhel-{{ ansible_facts['distribution_major_version'] }}-{{ ansible_facts['architecture'] }}-rpms
     packages_to_uninstall:
       - ceph-mds
       - ceph-mgr
@@ -49,13 +54,8 @@
 
             - name: disable older rhceph repositories if any
               rhsm_repository:
-                name: "{{ item }}"
+                name: "{{ repos_to_disable }}"
                 state: absent
-              loop:
-                - rhceph-4-tools-for-rhel-8-{{ ansible_facts['architecture'] }}-rpms
-                - rhceph-4-mon-for-rhel-8-{{ ansible_facts['architecture'] }}-rpms
-                - rhceph-4-osd-for-rhel-8-{{ ansible_facts['architecture'] }}-rpms
-              when: ansible_facts['distribution_major_version'] | int == 8
 
         - name: enable ceph package repositories
           when: ceph_origin in ['community', 'ibm']