downloads: split file and containers (#13581)

Splits the definitions into two dicts, while joining then for now to
preserve the downloads dict.

Update all consumers of the variables, which are roughly:
- manual includes of the download role (which will be removed in the
  short future)
- install tasks using the resolved 'dest' to find the artefacts

This will make further division of the downloads role easier.

roles/kubernetes-apps/argocd/tasks/main.yml

@@ -12,7 +12,7 @@
     cmd: >
       {{ kubectl }} apply -n {{ argocd_namespace }}
       --server-side=true --force-conflicts --field-manager=kubespray
-      -f - -f {{ downloads.argocd_install.dest }}
+      -f - -f {{ downloads_file.argocd_install.dest }}
     stdin: "{{ ns_object | to_json }}"
 
 # https://github.com/argoproj/argo-cd/blob/master/docs/faq.md#i-forgot-the-admin-password-how-do-i-reset-it

roles/kubernetes-apps/common_crds/gateway_api/tasks/main.yml

@@ -2,7 +2,7 @@
 - name: Gateway API | Download YAML
   include_tasks: "../../../../download/tasks/download_file.yml"
   vars:
-    download: "{{ download_defaults | combine(downloads.gateway_api_crds) }}"
+    download: "{{ download_defaults | combine(downloads_file.gateway_api_crds) }}"
 
 - name: Gateway API | Create addon dir
   file:

roles/kubernetes-apps/common_crds/prometheus_operator_crds/tasks/main.yml

@@ -2,7 +2,7 @@
 - name: Prometheus Operator CRDs | Download YAML
   include_tasks: "../../../../download/tasks/download_file.yml"
   vars:
-    download: "{{ download_defaults | combine(downloads.prometheus_operator_crds) }}"
+    download: "{{ download_defaults | combine(downloads_file.prometheus_operator_crds) }}"
 
 - name: Prometheus Operator CRDs | Install
   command:

roles/kubernetes-apps/helm/tasks/main.yml

@@ -26,7 +26,7 @@
 - name: Helm | Download helm
   include_tasks: "../../../download/tasks/download_file.yml"
   vars:
-    download: "{{ download_defaults | combine(downloads.helm) }}"
+    download: "{{ download_defaults | combine(downloads_file.helm) }}"
 
 - name: Helm | Copy helm binary from download dir
   copy: