Re-introduce RHEL 9 modularity testing in CI (#81160)

test/integration/targets/dnf/tasks/main.yml

@@ -59,7 +59,6 @@
 
 - include_tasks: modularity.yml
   when:
-    - astream_name is defined
     - (ansible_distribution == 'Fedora' and ansible_distribution_major_version is version('29', '>=')) or
       (ansible_distribution in ['RedHat', 'CentOS'] and ansible_distribution_major_version is version('8', '>='))
     - not dnf5|default('false')

test/integration/targets/dnf/vars/RedHat-9.yml

@@ -1,3 +1,2 @@
-# RHEL9.0 contains no modules, to be re-introduced in 9.1
-# astream_name: '@container-tools:latest/common'
-# astream_name_no_stream: '@container-tools/common'
+astream_name: '@php:8.1/minimal'
+astream_name_no_stream: '@php/minimal'