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

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

@@ -9,11 +9,8 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 - set_fact:
-    has_java_keytool: >-
-      {{
-        ansible_facts.os_family not in ['Darwin', 'FreeBSD']
-        and not (ansible_facts.distribution == "CentOS" and ansible_facts.distribution_version is version("7.0", "<"))
-      }}
+    has_java_keytool: >
+      {{ ansible_facts.os_family not in ['Darwin', 'FreeBSD'] }}
 
 - name: Include OS-specific variables
   include_vars: '{{ lookup("first_found", params) }}'