upstream tests: Removal of 'warn: no' from shell plugins

The parameter 'warn' from ansible.builtin.shell was deprecated in
ansible-core version 2.11 and removed in version 2.14.

This patch removes the usage of this parameter from ansible-freeipa
tests, and adds 'deprecated-command-syntax' to the skip list of
ansible-lint configuration to cope with the change in the linter.

tests/user/certmapdata/test_users_certmapdata.yml

@@ -161,11 +161,9 @@
     register: result
     failed_when: not result.changed or result.failed
 
-  - name: Remove certificate files.
+  - name: Remove certificate files.  # noqa: deprecated-command-syntax
     shell:
       cmd: rm -f "private{{ item }}.key" "cert{{ item }}.pem" "cert{{ item }}.der" "cert{{ item }}.b64"
     with_items: [1, 2, 3]
     become: no
     delegate_to: localhost
-    args:
-      warn: no  # suppres warning for not using the `file` module.