test: Configure Molecule testing framework

- Add Ansible collections configuration
- Update converge and prepare playbooks
- Restructure molecule.yml for improved testing

handlers/main.yml

@@ -18,7 +18,7 @@
       - "{{ bind9_libdir }}"
     dest: "{{
       bind9_backup_dir + '/bind9-config-' +
-      ansible_date_time.iso8601_basic_short + '.tar.gz' }}"
+      ansible_facts.date_time.iso8601_basic_short + '.tar.gz' }}"
     owner: root
     group: root
     mode: 0640