Only setup *_PROXY env variables where needed (#7095)

no_proxy is a pain to get right, and having proxy variables present causes issues
(k8s components get proxy configuration after upgrade, see #7100)

It's better to only configure what require proxy:
- the runtime (containerd/docker/crio)
- the package manager + apt_key
- the download tasks

Tested with the following clusters
- 4 CentOS 8 nodes
- 1 Ubuntu 20.04 node

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

roles/download/tasks/download_file.yml

@@ -66,6 +66,7 @@
     until: "'OK' in get_url_result.msg or 'file already exists' in get_url_result.msg"
     retries: 4
     delay: "{{ retry_stagger | default(5) }}"
+    environment: "{{ proxy_env }}"
 
   - name: download_file | Copy file back to ansible host file cache
     synchronize: