alloy(role): remove unpoller support

roles/alloy/tasks/main.yaml

@@ -61,9 +61,6 @@
     - name: Deploy blackbox-exporter config
       when: alloy_enable_blackbox_exporter
       ansible.builtin.include_tasks: blackbox-exporter.yaml
-    - name: Deploy unpoller exporter
-      when: alloy_unpoller_enabled
-      ansible.builtin.include_tasks: unpoller.yaml
 
     - name: Flush handlers
       ansible.builtin.meta: flush_handlers