Issue #000 feat: cleanup for backup

ansible/roles/prometheus-backup-v2/tasks/main.yml

 ---
 # tasks file for ansible/roles/prometheus-backup-v2
 # Issue: https://github.com/prometheus/prometheus/issues/5686
-- name: preparing snapshot
-  uri:
-    url: "{{ prometheus_url }}/api/v1/admin/tsdb/snapshot"
-    method: POST
-  register: temp_snap
-
 - name: taking snapshot
   uri:
     url: "{{ prometheus_url }}/api/v1/admin/tsdb/snapshot?skip_head=True"
@@ -32,11 +26,8 @@
 
 - name: Deleting snapshot
   file:
-    path: "{{ prometheus_data_dir }}/snapshots/{{ item }}"
+    path: "{{ prometheus_data_dir }}/snapshots/{{ snapshot_name }}"
     state: absent
-  with_items:
-    - "{{ snapshot_name }}"
-    - "{{ temp_snap.json.data.name }}"
 
 - name: Deleting archive snapshot
   file: