download: Remove checksums for all container

The pull by digest hasn't been working since 800c84dcc (download: use
full hash form (including hash alg), 2025-01-14), where the key was
renamed to checksum, but the download_container still checked sha256.

Stop pretending we pull by digest.

roles/download/tasks/check_pull_required.yml

@@ -12,13 +12,3 @@
   set_fact:
     pull_required: "{{ (download.image_name | regex_replace('^docker\\.io/(library/)?', '')) not in docker_images.stdout.split(',') }}"
   when: not download_always_pull
-
-- name: Check_pull_required | Check that the local digest sha256 corresponds to the given image tag
-  assert:
-    that: "{{ download.repo }}:{{ download.tag }} in docker_images.stdout.split(',')"
-  when:
-    - not download_always_pull
-    - not pull_required
-    - pull_by_digest
-  tags:
-    - asserts

roles/download/tasks/set_container_facts.yml

@@ -1,13 +1,4 @@
 ---
-- name: Set_container_facts | Set if containers should be pulled by digest
-  set_fact:
-    pull_by_digest: "{{ download.sha256 is defined and download.sha256 }}"
-
-- name: Set_container_facts | Define by what name to pull the image
-  set_fact:
-    image_reponame: >-
-      {%- if pull_by_digest %}{{ download.repo }}@sha256:{{ download.sha256 }}{%- else -%}{{ download.repo }}:{{ download.tag }}{%- endif -%}
-
 - name: Set_container_facts | Define file name of image
   set_fact:
     image_filename: "{{ download.image_name | regex_replace('/|\0|:', '_') }}.tar"