Add nodejs v16 project templates for Zed release

This commit defines the nodejs v16 job template so that horizon
and all its plugins can use this template to run nodejs jobs with
nodejs v16 which is the testing runtime for Zed release[1].

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

Change-Id: Ie1ff4ba5d73a9b5969060f4b9b7d3e8088875a6c

zuul.d/project-templates.yaml

@@ -2425,6 +2425,31 @@
               node_version: 14
             nodeset: ubuntu-focal
 
+- project-template:
+    name: nodejs16-jobs
+    description: |
+      Run lint and test jobs using Node 16.
+    check:
+      jobs:
+        - nodejs-run-lint:
+            vars:
+              node_version: 16
+            nodeset: ubuntu-focal
+        - nodejs-run-test-browser:
+            vars:
+              node_version: 16
+            nodeset: ubuntu-focal
+    gate:
+      jobs:
+        - nodejs-run-lint:
+            vars:
+              node_version: 16
+            nodeset: ubuntu-focal
+        - nodejs-run-test-browser:
+            vars:
+              node_version: 16
+            nodeset: ubuntu-focal
+
 - project-template:
     name: nodejs4-docs
     description: |
@@ -2489,6 +2514,21 @@
             vars:
               node_version: 14
 
+- project-template:
+    name: nodejs16-docs
+    description: |
+      Run docs jobs using Node 16.
+    check:
+      jobs:
+        - nodejs-run-docs:
+            vars:
+              node_version: 16
+    gate:
+      jobs:
+        - nodejs-run-docs:
+            vars:
+              node_version: 16
+
 - project-template:
     name: tempest-plugin-jobs
     description: |