Setup project template for nodejs v16 jobs

This patch defines a project template "horizon-nodejs-jobs"
for nodejs v16 jobs which is the next LTS version of nodejs[1]
and also, the runtime for the Zed cycle[2]. Next step is to
the horizon plugins use this template to run nodejs v16 jobs
and once it's pass in all horizon plugins we can remove
nodejs v14 jobs completely.

This patch also do few cleaups:
• remove nodejs v14 job to run on horizon gate because we don't
  need to run both nodejs v14 and nodejs v16 jobs for horizon.
• replace nodejs v14 experimental xstatic job with nodejs v16 job.
• replace horizon-nodejs14-run-test periodic job with nodejs v16.

[1] https://nodejs.org/en/about/releases/
[2] https://governance.openstack.org/tc/reference/runtimes/zed.html#node-js-runtime-for-zed

Depends-On: https://review.opendev.org/c/openstack/openstack-zuul-jobs/+/831912
Change-Id: Ic11f2c3bd7a6a09c8fa6fb7a457e83e889deed6b

.zuul.d/nodejs-jobs.yaml

@@ -26,6 +26,34 @@
       - openstack/horizon
       - openstack/requirements
 
+- job:
+    name: horizon-nodejs16-run-lint
+    parent: nodejs-run-lint
+    description: |
+      Run lint using Node 16 for horizon plugins.
+    vars:
+      node_version: 16
+      tox_constraints_file: "{{ ansible_user_dir }}/{{ zuul.projects['opendev.org/openstack/requirements'].src_dir }}/upper-constraints.txt"
+    nodeset: ubuntu-focal
+    pre-run: playbooks/horizon-nodejs/pre.yaml
+    required-projects:
+      - openstack/horizon
+      - openstack/requirements
+
+- job:
+    name: horizon-nodejs16-run-test
+    parent: nodejs-run-test-browser
+    description: |
+      Run test using Node 16 for horizon plugins.
+    vars:
+      node_version: 16
+      tox_constraints_file: "{{ ansible_user_dir }}/{{ zuul.projects['opendev.org/openstack/requirements'].src_dir }}/upper-constraints.txt"
+    pre-run: playbooks/horizon-nodejs/pre.yaml
+    nodeset: ubuntu-focal
+    required-projects:
+      - openstack/horizon
+      - openstack/requirements
+
 - project-template:
     name: horizon-nodejs14-jobs
     description: |
@@ -49,3 +77,21 @@
             voting: false
         - horizon-nodejs14-run-test:
             voting: false
+
+- project-template:
+    name: horizon-nodejs-jobs
+    description: |
+      This project template is defined to run lint and test jobs using
+      Node LTS version (i.e. 16 now) for horizon plugins. horizon plugins
+      can use this template to run nodejs jobs. So if we want to update
+      nodejs version in horizon plugins we can update this template to use
+      the job with the latest node version and not many changes are required
+      in the horizon plugins side.
+    check:
+      jobs:
+        - horizon-nodejs16-run-lint
+        - horizon-nodejs16-run-test
+    gate:
+      jobs:
+        - horizon-nodejs16-run-lint
+        - horizon-nodejs16-run-test

.zuul.d/project.yaml

@@ -2,7 +2,7 @@
     templates:
       - check-requirements
       - horizon-cross-jobs
-      - horizon-nodejs14-jobs
+      - horizon-nodejs-jobs
       - horizon-non-primary-django-jobs
       - openstack-lower-constraints-jobs
       - openstack-python3-yoga-jobs
@@ -27,8 +27,8 @@
       jobs:
         - horizon-integration-tests-xstatic-master
         - horizon-tox-py36-xstatic-master
-        - horizon-nodejs14-run-test-xstatic-master
+        - horizon-nodejs16-run-test-xstatic-master
     periodic:
       jobs:
-        - horizon-nodejs14-run-test
+        - horizon-nodejs16-run-test
         - horizon-integration-tests

.zuul.d/xstatic-master.yaml

@@ -31,7 +31,7 @@
     required-projects: *xstatic-projects
 
 - job:
-    name: horizon-nodejs14-run-test-xstatic-master
-    parent: horizon-nodejs14-run-test
+    name: horizon-nodejs16-run-test-xstatic-master
+    parent: horizon-nodejs16-run-test
     required-projects: *xstatic-projects
     pre-run: playbooks/npm-test-xstatic-master/pre.yaml