dnszone: Use FQCN for ansible.builtin

Use Fully Qualified Collection Name (FQCN) for ansible builtins. This is
ansible.builtin.set_fact instead of set_fact for example and aplies for
all actions that are part of ansible.builtin.

All the replaced ansible.builtins:
  assert, command, copy, debug, fail, fetch, file, import_playbook,
  import_tasks, include_role, include_tasks, include_vars, package,
  set_fact, shell, slurp, stat, systemd

tests/dnszone/test_dnszone.yml

@@ -8,7 +8,7 @@
 
   # Setup
   - name: Setup testing environment
-    include_tasks: env_setup.yml
+    ansible.builtin.include_tasks: env_setup.yml
 
   # Tests
   - name: Check if zone is present, when in shouldn't be.
@@ -267,4 +267,4 @@
 
   # Teardown
   - name: Teardown testing environment
-    include_tasks: env_teardown.yml
+    ansible.builtin.include_tasks: env_teardown.yml