[PR #11715/79431c36 backport][stable-12] integration tests: remove CentOS conditionals (#11726)

integration tests: remove CentOS conditionals (#11715)

* test(integration): remove CentOS references

* further simplification

* more removals

* rollback systemd_info for now

* ufw: not trivially used with RHEL9 and RHEL10, simplifying tests

* remove tasks for setup_epel where unused

* adjustments from review

(cherry picked from commit 79431c36b5)

Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>

tests/integration/targets/setup_pkg_mgr/tasks/main.yml

@@ -26,19 +26,6 @@
     cacheable: true
   when: ansible_facts.os_family == "Archlinux"
 
-- shell:
-    cmd: |
-      sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/*.repo
-      sed -i 's%#baseurl=http://mirror.centos.org/%baseurl=https://vault.centos.org/%g' /etc/yum.repos.d/*.repo
-  when: ansible_facts.distribution in 'CentOS' and ansible_facts.distribution_major_version == '7'
-
-- shell:
-    cmd: |
-      sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-Linux-*.repo
-      sed -i 's%#baseurl=http://mirror.centos.org/$contentdir/$releasever/%baseurl=https://vault.centos.org/8.4.2105/%g' /etc/yum.repos.d/CentOS-Linux-*.repo
-  ignore_errors: true  # This fails for CentOS Stream 8
-  when: ansible_facts.distribution in 'CentOS' and ansible_facts.distribution_major_version == '8'
-
 - when: ansible_facts.os_family == "Archlinux"
   block:
     - name: ArchLinux specific setup