chore: rename .yaml extensions to .yml for consistency

roles/proxmox-lxc-provision/tasks/stop.yml

@@ -0,0 +1,12 @@
+---
+- name: Stop container if it is running
+  community.general.proxmox:
+    <<: "{{ proxmox_api_connection }}"
+    vmid: "{{ lxc_vmid | default(omit) }}"
+    hostname: "{{ lxc_hostname | default(omit) }}"
+    state: "stopped"
+  register: stop_result
+  failed_when: |-
+    stop_result.failed and
+    ('not running' not in stop_result.msg) and
+    ('does not exist' not in stop_result.msg)