refactor(partitioning): extract VG name to defaults variable

roles/partitioning/tasks/xfs.yml

@@ -2,7 +2,7 @@
 - name: Create and format XFS logical volumes
   when: system_cfg.features.cis.enabled or item.lv not in ['home', 'var', 'var_log', 'var_log_audit']
   community.general.filesystem:
-    dev: /dev/sys/{{ item.lv }}
+    dev: /dev/{{ partitioning_vg_name }}/{{ item.lv }}
     fstype: xfs
     opts: "{{ '-m bigtime=0 -i nrext64=0,exchange=0 -n parent=0' if is_rhel | bool else omit }}"
     force: true