ci: Tighten Ansible error checking during image prep

tests/image_prep/ansible.cfg

@@ -1,8 +1,10 @@
 
 [defaults]
+any_errors_fatal = true
 # Ansible >= 6 (ansible-core >= 2.13)
 callback_result_format = yaml
 deprecation_warnings = false
+duplicate_dict_key = error
 strategy_plugins = ../../ansible_mitogen/plugins/strategy
 retry_files_enabled = false
 display_args_to_stdout = True
@@ -10,4 +12,6 @@ no_target_syslog = True
 host_key_checking = False
 
 [inventory]
-unparsed_is_fatal = true
+any_unparsed_is_failed = true
+host_pattern_mismatch = error
+unparsed_is_failed = true