remove the set_fact action which raise error in the CI (#9462)

roles/bootstrap-os/tasks/main.yml

@@ -92,14 +92,6 @@
   tags:
     - facts
 
-- name: Set os_family fact for UOS Linux
-  set_fact:
-    ansible_os_family: "RedHat"
-    ansible_distribution_major_version: "8"
-  when: ansible_distribution == "UnionTech"
-  tags:
-    - facts
-
 - name: Install ceph-commmon package
   package:
     name: