ci: Add support for CentOS 9 Stream on upstream CI.

This patch adds support for running upstream tests using Centos-9
stream images. Both pull request and nightly tests are updated.

molecule/centos-9/molecule.yml

@@ -0,0 +1,18 @@
+---
+driver:
+  name: docker
+platforms:
+  - name: centos-9
+    image: quay.io/ansible-freeipa/upstream-tests:centos-9
+    pre_build_image: true
+    hostname: ipaserver.test.local
+    dns_servers:
+      - 127.0.0.1
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+    command: /usr/sbin/init
+    privileged: true
+provisioner:
+  name: ansible
+  playbooks:
+    prepare: ../resources/playbooks/prepare.yml