chore: remove unused prometheus ansible task file

data/ansible/roles/prometheus/tasks/handle_file.yaml

@@ -1,22 +0,0 @@
----
-- name: Copy file (if not .j2)
-  become: true
-  ansible.builtin.copy:
-    src: '{{ file_src }}'
-    dest: '{{ file_dest }}'
-    owner: '{{ grafana_user }}'
-    group: '{{ grafana_user }}'
-    mode: '0644'
-  when: not file_src.endswith('.j2')
-  notify: Restart grafana
-
-- name: Template file (if .j2)
-  become: true
-  ansible.builtin.template:
-    src: '{{ file_src }}'
-    dest: '{{ file_dest }}'
-    owner: '{{ grafana_user }}'
-    group: '{{ grafana_user }}'
-    mode: '0644'
-  when: file_src.endswith('.j2')
-  notify: Restart grafana