user: 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/user/certmapdata/test_users_certmapdata.yml

@@ -6,7 +6,7 @@
 
   tasks:
   - name: Generate self-signed certificates.
-    shell:
+    ansible.builtin.shell:
       cmd: |
         openssl req -x509 -newkey rsa:2048 -days 365 -nodes -keyout "private{{ item }}.key" -out "cert{{ item }}.pem" -subj '/CN=test'
         openssl x509 -outform der -in "cert{{ item }}.pem" -out "cert{{ item }}.der"
@@ -162,7 +162,7 @@
     failed_when: not result.changed or result.failed
 
   - name: Remove certificate files.  # noqa: deprecated-command-syntax
-    shell:
+    ansible.builtin.shell:
       cmd: rm -f "private{{ item }}.key" "cert{{ item }}.pem" "cert{{ item }}.der" "cert{{ item }}.b64"
     with_items: [1, 2, 3]
     become: no