Modernize ensure-nodejs

The ensure-nodejs role defaults to install nodejs 6 which produces this
error currently:

  Failed to update apt cache: W:The repository
  'https://deb.nodesource.com/node_6.x noble Release' does not have a
  Release file., W:Data from such a repository can't be authenticated
  and is therefore potentially dangerous to use.

We need to make a few changes to bring this ensure-nodejs role up to
modern expectations for nodesource usage. First we drop the default
nodejs version from ensure-nodejs. Everyone is already setting this
value to make this role work or they are broken and will need to change
something anyway. This gets us off of the nodejs update treadmill in
this role.

Then with nodejs 16 and newer there is a new gpg key and no deb-src
packages so we need to change the apt configuration if using 16 and
newer. We make these changes to match the corresponding setup_16.x etc
scripts from nodesource.

Change-Id: I0d5c93e4fbcee0be2cc477bf9f625e419a2b9bd1

roles/ensure-nodejs/defaults/main.yaml

@@ -1,2 +0,0 @@
----
-node_version: 6

roles/ensure-nodejs/tasks/main.yaml

@@ -25,6 +25,17 @@
     repositories_list:
       - repo: deb-src https://deb.nodesource.com/node_{{ node_version }}.x {{ ansible_distribution_release }} main
       - repo: deb https://deb.nodesource.com/node_{{ node_version }}.x {{ ansible_distribution_release }} main
+  when: node_version | int < 16
+
+- name: Add all repositories
+  include_role:
+    name: ensure-package-repositories
+  vars:
+    repositories_keys:
+      - url: https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key
+    repositories_list:
+      - repo: deb https://deb.nodesource.com/node_{{ node_version }}.x nodistro main
+  when: node_version | int >= 16
 
 # Use template so that we can easily update this in the future to be able to
 # use a mirror location.

zuul-tests.d/js-roles-jobs.yaml

@@ -7,6 +7,7 @@
     run: test-playbooks/simple-role-test.yaml
     vars:
       role_name: ensure-nodejs
+      node_version: 20
 
 - job:
     name: zuul-jobs-test-ensure-yarn
@@ -18,6 +19,7 @@
     run: test-playbooks/simple-role-test.yaml
     vars:
       role_name: ensure-yarn
+      node_version: 20
 
 - job:
     name: zuul-jobs-test-fetch-javascript-tarball

zuul.d/python-jobs.yaml

@@ -327,7 +327,7 @@
          Command to pass to npm.
 
       .. zuul:jobvar:: node_version
-         :default: 6
+         :default: 14
 
          The version of Node to use.