refactor: Update check-exists.yml to check by vmid or hostname

roles/proxmox_lxc_provision/tasks/main.yml

@@ -12,15 +12,12 @@
     community.proxmox.proxmox_vm_info: *proxmox_defaults
   block:
     - name: Check if container exists
-      community.proxmox.proxmox:
-        vmid: "{{ lxc_vmid }}"
-        state: current
-      register: existing_container
-      ignore_errors: true
+      ansible.builtin.include_tasks:
+        file: check-exists.yml
 
     - name: Skip if container already exists
       meta: end_host
-      when: existing_container is succeeded
+      when: lxc_exists | bool
 
     - name: Container source must be defined (lxc_clone_from or lxc_template)
       ansible.builtin.fail: