remove atomic support because reached end of live (#5783)

roles/bootstrap-os/tasks/bootstrap-centos.yml

@@ -24,15 +24,6 @@
 
 # CentOS ships with python installed
 
-- name: Check if this is an atomic host
-  stat:
-    path: /run/ostree-booted
-  register: ostree
-
-- name: Store the fact if this is an atomic host
-  set_fact:
-    is_atomic: "{{ ostree.stat.exists }}"
-
 - name: Check presence of fastestmirror.conf
   stat:
     path: /etc/yum/pluginconf.d/fastestmirror.conf
@@ -73,5 +64,3 @@
     name: "{{ ( (ansible_distribution_major_version | int) < 8) | ternary('libselinux-python','python3-libselinux') }}"
     state: present
   become: true
-  when:
-    - not is_atomic