vault: 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/vault/env_cleanup.yml

@@ -41,7 +41,7 @@
       state: absent
 
   - name: Remove files from target host.
-    file:
+    ansible.builtin.file:
       path: "{{ ansible_facts['env'].HOME }}/{{ item }}"
       state: absent
     with_items:
@@ -58,7 +58,7 @@
     - out.txt
 
   - name: Remove files from controller.
-    file:
+    ansible.builtin.file:
       path: "{{ playbook_dir }}/{{ item }}"
       state: absent
     delegate_to: localhost